Question about Upper Pines, Yosemite?

Question

I'm heading up there in about a week (yes I have a reservation) and have everything set but I need to know If I need to bring all the water I'm going to use for the week or If there is a place by the camp where I can fill my water jugs? Also, I heard something about a ranger led star watching thing they do occasionally for the kids but I have not seen any info on it.