I tried to do a 48h play, i got water crackers 2 packets, 2 different kinds of dips which were sweet potato and beetroot, oat bran to mix with milk and my protein powder for a quick as -blam!- fix, 200g block of normal cadbury milk chocolate, about 4 bananas, some backup milk, and a 4 pack of monster energy drink. My review is, chips and dip are good and easy, they leave -blam!- loads of crumbs though which can leave your surroundings uncomfortable, 4 energy drinks just isnt enough, maybe 6-7 for a 48h straight 5 for a 24h straight. Oat bran with milk and protein powder will put you the -blam!- to sleep if you drink it in under 30 mins. Chocolate helps a fair bit, bananas are your saving grace, 10 bananas would be a safe bet, I made it too 18h and fell asleep at the controller waiting 15 sec for that heavy ammo hahahaha Edit1: i also got two family sized pizzas which i ate in the morning and at 12pm about an hour before the crash. Pizzas should be eaten 4 slices at a time or it makes you tired