In Mexico years ago, a doctor there told me to drink only the bottled apple juice drink (very popular in Mexico, can't remember the name) and beer- drink water only in a good hotel (preferably as a chaser, he said, downing a tequila). Like here, most soft drinks in Mexico at that time were high in caffeine, but this apple drink wasn't.

I think all doctors recommend lots of water, but mine suggests it be at least half fruit juices- grape and cranberry being two she recommends.