My friend and I intend to do part of the Tour de Mont Blanc this summer. While we are aware of the refuges and huts, we would prefer to stay in bivouacs for the night (at least one night, but probably two).
Our plan is to hike for 3 days. Evidently, we are not considering carrying 6kg of water for these three days. Our main idea was to bring purifying pills (efervescent) and drink water from creeks, streams and ponds. We are considering hiking both below and above the tree line.
I have been reading online and spoke with a friend who successfully hiked for two days only with the pills. But, since I am inexperienced on long (more than 2 days) hikes, I do not know if this is the standard approach or if we are making a serious mistake.
The part of the trail in question is between Les Contamines and Courmayeur passing through Les Chapieux, but I would like to keep the question as general as possible, as I intend to do more long hikes in the future.