I brought two 1 liter bottles (on right), one 750ml bottle (on left), and a smaller bottle (not shown). I feel I brought 1 too many bottles and may eliminate one of the liter bottles. Not sure. Maybe depending on the trip.
Katadyn Hiker Pro. I had the larger one, but returned it because it wasn't working properly. Got the smaller lighter weight one in exchange. I do need to run it once before the next trip though. Still need backup sterile tablets for emergencies!