I don't know if this has been mentioned yet but you could use those new carbonation pills. I think they're called prime dose? It has yeast nutrient, yeast, and sugar all in the pill. 2 capsules per 12oz bottle.
I've been all over the internet looking for some .psd files of photo-realistic bottles or labels for doing some mock-ups. All of the ones I've found are awful. Does anyone have any that they've made or downloaded?
Surely every brewery that has nice mockups didn't ALL hire someone to do them...