Unless something changed recently, you don't need to contact anyone, however, you might want to call or stop at either Denton Hill forestry office or the Cross Forks forestry office and let them know you are on the trail and where you will be parked as well as your license plate and vehicle description. There once was a trail register down the Slate Run side trail near where it junctions the BFT. I don't know if it is still there.
I was at Tioga last week and water was running well there. I have never seen any of the runs dry on the BFT over the past 20 some odd years, though.