Welcome to the board Bryan...
Well assuming that you will have a Trainer, he will have the food matter and the training regime worked out...he will even tell you how many girls you can root!!!
There are many varying foods on the street stalls...plenty of noodle soups and meat skewers...if you eat lots of them maybe it will be enough...there's lots of seafood on Phuket...good source of protein...but the seafood tends to be more expensive than other foods...
You can always get a steak...Australian and NZ Steak available on the Island...but this will be a little more expensive also...can't name any restaurants for steak at the moment...but other BMs may have some ideas..
Always plenty of chicken and pork dishes in thai restaurants...mostly very cheap.
Marcia