[ smart. valid. 100% correct. but good question. ]

I've wondered that, too. Kind of like I've wondered how food in the mess hall's made or the dogs are being taken care of in the park when it's supposedly just us. Things have to be refueled and restocked when we land, but there's a lot of the ship we don't have access to either. It's possible there's just a bunch of stock piled away that gets replenished when stuff's low.