Drinking During the Ten Days of Repentance

We are accustomed to fast on the eve of Rosh Hashanah

Rema: And those that are exacting (Hasidim) are accustomed to fast every one of the ten days. And such is correct to do. And all these fasts are not necessary to do, and they are not announced on Monday and Thursday, even the (fast of) the eve of Rosh Hashana. If there is a circumcision on the eve of Rosh Hashana, one may eat. And most people are accustomed to eat on the eve of Rosh Hashana before daybreak; because the non-Jews are accustomed to fast on the eve of their holidays.

Rebbi Ḥama ben Rebbi Ḥanina and Rebbi Hoshaia:
One said: "Is there a people like this people? Usually in the world, a person who knows that he will stand in trial dresses in black, wears black headdress, and lets his beard grow, since he does not know how his trial will end. But Israel are not so, but they wear white, wear white headdress, cut their beard, eat, and drink, and are happy. They know that the Holy One, praise to Him, will perform wonders for them."
And the other one said: "Is there a people like this people? Usually in the world if the ruler says, the trial is today, but the robber says, tomorrow is the trial, whom does one listen to, not the ruler? But the Holy One, praise to Him, is not like this. If the Court said, today is New Year’s Day, the Holy One, praise to Him, says to the angels of service, put up the dais, [summon defenders, summon accusers, for My children said that today is New Year’s Day.] If the Court took counsel to transfer it to the next day, the Holy One, praise to Him, says to the angels of service, remove the dais, remove the defenders, remove the accusers, for My children took counsel to transfer to tomorrow. What is the reason? Certainly, it is a rule for Israel, a law of the God of Jacob. If it is not a rule for Israel, so to speak it is not a law for the God of Jacob."

...
Note: And there are some who are accustomed to eat a sweet apple with honey. And they say "May You renew upon us a sweet New Year". And thus are we accustomed. And some eat pomegranates and say "May our merits increase like a pomegranate". And we are accustomed to eat fatty meats and all sorts of sweets.

One eats, drinks and is merry [on Rosh Hashanah.] We do not fast, neither on Rosh Hashanah, nor on Shabbos Shuva (the Shabbos of Repentance which is between R'H and Yom Kippur). However, people should not eat to complete satiation, so that they do not reach light-headedness, and that the fear of God should remain on them.

Which means to say that even though it's the day of judgement, nevertheless, it's a commandment of you shall rejoice on your holiday which is relevant to this because it's also within the category of a festival as it is written and you shall palast a shofar on the month of the hiding of the day of our festival. And it is said in femia they got says each fatty food entry Suites. Because the day is Holy to our Lord and you should not hold yourself back because it's something of the Lord something something something

(2) 2. During Kiddush on the 2nd night (of R'H) wear a new garment [Haagos Maimoni Chapter 29 from the Laws of Shabbos] or place a new fruit, and say the blessing of Sheychianu. Yet, if there is not found a new garment or a new fruit, nonetheless, say Sheychianu.

(Rema) We fast (Tzom Gedaliah) the day following Rosh HaShana [Tur] and it is a Public Fast.

Everyday between Rosh HaShana to Yom Kippur, we increase prayers and supplications.

All are obligated to fast on these Four fasts, and it is forbidden to break the fence (i.e. not fast)

Note (Rema): However, those who are pregnant or nursing that are very distressed, do not fast. And even if they (the above) are not distressed, they are not obligated to fast, rather customarily they are strict. (This lack of obligation for those in a lack of distress) is specifically on the 3 fasts, but Tisha B'av, they are obligated to complete (the fast)

If they are weak, it would seem that they should not be stringent. In any case, even someone who needs to eat should not feast on meat and wine, but [should eat] only what they need. And likewise, children who understand [enough] to mourn: although we are not obliged to educate them [to fast] even at age twelve and even for a fast of a few hours, it is in any case appropriate to educate them to eat just enough to sustain their bodies, water and other simple food as they require, in order that they will mourn with the community.

(1) Even if one whom is not careful regarding non-Jewish bread [during the year], should be careful (during the ten days.)

It is a mitzvah to eat on Erev Yom Kippur and even to increase the meal.

Haga: and it is forbidden to fast on this day even if it is a fast due to a bad dream (Maharil) and if one made a vow to fast see above chapter 570:2

We eat and stop before Bein Hashamashos (Twilight). Due to it is necessary to add from the weekday to the Holy (day of Yom Kippur). And this added time does not have a measure (i.e. a Halachic minimum requirement). Rather prior to Twilight whose time is (the amount time to walk) 1500 amah (amah is a halachic measure between 48-60 centimeters) before the Night, it is necessary to add from the weekday to the Holy day, a little or a lot.

Women who eat and drink until dark, and they do not know it is a command to add from the weekday to the Holy day, we do not contest their actions in order that they do not so willingly.

On the eve of Yom Kippur, there is to him to only eat light foods for digestion in order that he not be satiated and stuffed when he prays.

Note (Rema): And similarly, we do not eat things that heat the body, so that it does not come to keri (a seminal emission), and not to eat milk products that increase seed (i.e. semen). Yet by the morning meal, the custom is to eat [Maharil].

(1) The night of Yom Kippur is identical [in practice] to the day. What is forbidden on Yom Kippur? Labour, eating and drinking, washing, anointment, wearing [leather] shoes, and sexual relations. However, only labour and eating and drinking are punishable by Karet, (divine excommunication).

(2) 2. A pregnant woman who smells and her face changes even if she doesn't say "I need it (the food she smells"), we whisper to her in her ear that it is Yom Kippur. If she calms down with this remainder, good. If not, we feed her until she calms down.

(7) 7. When feeding a pregnant woman or sick person, we feed them a little at a time in order that it does not combine to the shiur (Halachic minimum amount to transgress the Biblical prohibition to eat). Therefore, we feed them like 2/3 of a medium-sized egg and wait (the amount of time) necessary to eat 4 eggs. And for drinking, the sick person checks themselves (i.e. prior to the fast) how much in order to fill one side (of the mouth), and it will be shown what a cheekful is (for that person which is the shiur for drinking).

We give them to drink less from that shiur (see paragraph 7) and wait between each drink (the time) necessary to eat 4 eggs. Or at least, wait between each drink (the time) necessary to drink the shiur reviis (literally a 1/4th because it is 1/4 lug, another Halachic measurement, a reviis is appx 3-5 fl. oz.). Yet, if we calculate that these measurements are insufficient to him (the sick one) or the sick person says so (i.e. they are not enough) or even that we are uncertain in the matter, we give food and drink to him as necessary (i.e. whatever is sufficient even beyond the shiur of transgression) immediately.

We do Havdala on the cup (of wine), but does not bless on spices even if it (Yom Kippur) took place on Shabbos.

Note (Rema): ...and we eat and (drink)

upon the departure of Yom Kippur, since it's sort of a holiday.