I used to have a whole series of what I would eat and drink to make sure I was in the best shape and mindset before a gig, but now, when I play gigs more nights than I have off, and occasionally have 2 or 3 full length gigs in the same day, I have learned that you just gotta do what you can. Yesterday we played a music festival on empty stomachs, because Google Maps was WAY off on how long it would take to get there, and we basically arrived and ran right onto the stage. After that, our options were...cheesesteaks. So I wolfed one down, and we were on the road to a community pool party we were playing. Got there with about 30 minutes before we had to hit our first note, so we threw the gear up, soundchecked, and started right away. Between sets, we were brought cold chicken nuggets and fries. Whatever. Gotta eat...all of this time playing was outdoors in 90 degree heat. Still have to play at the top of your game though.