Today I took the kids out for a slice of pizza, and got them separate bottled waters (the place didn't offer tap). I figured if I got them a single bottled water, a fight might break out at some point. Maybe I was just being a pessimist, but I didn't have the energy to deal with it so I just got two.

They also used to fight over MagnaTiles until we got a bunch more, so that's not an issue any more. I don't love this as a general approach though. I'm working on getting them to work out any conflicts between them, rather than just getting two of things.

What things do your kids squabble over?