what foods or drinks are prohibited from bringing back home to the US
Consult the US Customs and Border Control website for the latest
https://help.cbp.gov/s/article/Article-3619?language=en_US
Prohibited:
https://www.cbp.gov/travel/us-citizens/know-before-you-go/prohibited-and-restricted-items
Some of it very much depends where you're going - some items can't be brought back if coming from the UK (where foot & mouth disease still exists), but can from other countries.
Generally, food can be brought back if it's processed; no fresh fruits or veggies can be, though.
What are you thinking of bringing back and from where?
And declare, declare, declare.