[quote=@User]
is this gonna be a realistic RP, so where we need sleep, water, food and stuff
[/quote]

Realistic in that no one is going to pull a laser gun out of their bum, and that no one is going to batter a horde of zombies to death with a rolled up news paper.

Not realistic to the point of OHHHHHHHHHHH MYYYYYYYYY GOOOOOOOOOOOD THIS IS BORING! Any sleeps will be covered when I 'fast forward' the RP at certain points. 

EDIT: On the question of food and water, I'll keep a list of the group's supplies, and deduct from it over time (players will be informed as it happens) - unless they use them in their posts, of course. So for example, if the group beds down in a hideout for the night, they can expect to wake up minus a bottle of water and some food.