You have several options here, my brother. Firstly, bring some protein powder in a baggie or whatever you wish to carry it in. Secondly, bring some tuna in the can or in a dish or in some tupperware or whatever. However, I would advise you to put it on ice if you've opened it already, despite what the other fellow said. Trust me, intestinal disease sucks and ruins your Saturday workout while you sit in a hostpital on an IV. This summer, I worked 12 hour days and I lived on canned tuna, cereal and bagels. I know my carb choices weren't the best, but they were the best I could do at 4:00 in the morning. Either way, I gained about 10 pounds. So bring whatever you can. My personal advice is tuna and anything complex-ish carbohydrate.