Haven't done it yet this year, but last year was even more dry and the only water surprise was the fact the creek into Sandy Meadow was dry. You'll parallel Bubbs Creek most of the way to Forrester. On the south side are several lakes, Tyndall Creek, Wright Creek and Wallace Creek - which seem to flow year round.
You can't camp at Bullfrog Lake but just north of the lower trail right before the lake along a small creek are excellent campsites.
Bears really like Vidette Meadow, but seem to have gotten the word that bear canisters work.
Two years ago there were 70+ folks camped at the Tyndall bear box one night. Go up or down Tyndall Creek, or south to the Frog Ponds to escape the crowds. The area downslope from the little lake west of the trail on the Bighorn Plateau is a great campsite. Instead of going all the way to Wallace Creek, check out Wright Lakes Basin, or the excellent campsite south of the trail right before the Wright Creek crossing.
Be adventurous - get a bit off trail and have fun.