I've never seen any of those campsites full before, and I've been there a bit. You shouldn't have any problem especially on a Tuesday night.
As of June 12th, there was no running water yet.
As mentioned, you can rent bear canisters from the Visitor's center where you can pick up your permits (if needed). There are bear boxes at the campgrounds at Horseshoe Meadows.
Last edited by hikern8; 06/15/10 11:22 PM.