yea, i wasn't specific enough, I would definatly have a back up water for like, LC or something like that. Honestly, you're right, there's alwasy the car, but if your camelpack breaks you have no other hydration option, like, you couldn't carry water for any other game after the one it failed in.
I personally carry 4 liters (yea its a tone, but i drink A LOT and if anyone got dehydrated or anything, I would have some for them) 3 liters in my camelbak and 1 in my nalgene.
On the topic of rigs.
BLKKROW, i honestly think you should save up some money and get a nicer rig.