The Katadyn BeFree 1 liter water filter is simple, compact and has excellent flow rate. It has served me well on long gravel rides in the middle of nowhere.
Last Tuesday I did 80 miles with 8000+ ft climbing in a very remote area and stopped twice to filter for a total of at least 7 liters. Two bottles in the triangle contained water and a Magnum bottle on the fork was used with Nuun for electrolyte drink.
A small frame bag contained pickles, two turkey wraps, a can of pringles crushed and poured into a ziplock bag and Lara bars, pump, Katadyn filter and jacket.
A top tube bag contained gels, blocks, Endurolytes and Nuun tabs.
-Tim-