Everybody here with slashing tires and me just thinking water in the tank sounds nice. But I just recommend putting water in the tank and maybe some salt and a dash of fresh piss. The truck will run but eventually it's gonna die and will smell like piss for a bit. If it doesn't die, the salt and water mixture will start to corrode the interior of the gas tank.
Better is to piss on the windshield, goes into the AC intake and the whole interior smells of piss until you strip the whole thing out and wash/replace it. Bonus points if you're super dehydrated.