Men:[1]

Men [includes oneself and his adult male household members[2]] are obligated to drink wine [every day of Yom Tov and Chol Hamoed[3]] in order to fulfill their Mitzvah of Simcha. One who does not drink wine does not fulfill the command. In addition to drinking wine, there is also a [Biblical[4]] Mitzvah, although not an obligation, to eat meat and other delicacies[5]. [One who increases in eating other delicacies and doing other matters of joy[6] is as well considered to be fulfilling the Biblical command, although he is not obligated in doing so.[7]]

How much wine must a man drink?[8]                         

Revius

Must one drink grape juice in exchange for wine?[9]

No.

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[1] 529:7

The ruling in 242:1 and KU”A 2: There Admur mentions plainly that eating and drinking such as wine and meat is part of the Biblical Mitzvah of Simcha. Vetzaruch Iyun as there it implies a) meat is also a Biblical Mitzvah b) Everyone fulfills the Mitzvah through eating and drinking.

[2] Meaning that the man of the house is obligated to verify that they drink wine. Vetzaruch Iyun

[3] So is implied from Admur 529:6

[4] 242:1 implies eating meat and other delicacies is Biblical and not a mere Mitzvah. See next footnote regarding this seeming contradiction.

[5] 242:1 writes plainly that there is a Biblical Mitzvah of Simcha in eating and drinking on Yom Tov, and only in the Kuntrus Achron does he write “for example meat and wine”, hence clearly implying there is a Mitzvah with all delicacies. So is also implied from the concluding words of Admur 529:7 “we are to rejoice with all other forms of Simcha”. Now although Admur there states clearly that it is not an obligation but a mere Mitzvah, unlike what He wrote in 242:1, one can perhaps say that both rulings hold true without contradiction, as although one only fulfills his obligation of Simcha by drinking wine as writes Admur in 529:7, nevertheless when he eats meat and other delicacies he also fulfills the Biblical Mitzvah of Simcha, as he is merely increasing in the Mitzvah. In other words the Mitzvah of Simcha begins with wine although extends as well to all other delicacies. Hence one who drinks wine can now extend and fulfill the Mitzvah with meat and all other delicacies and matters of Simcha. Vetzaruch Iyun.

[6] So is also implied from the concluding words of Admur 529:7 “we are to rejoice with all other forms of Simcha”.

[7] See two footnotes above.

[8] Chol Hamoed Kihilchaso 1:12

[9] Chol Hamoed Kihilchaso 1:11