At the end of this year I'm leading a mission team to Tanzania for two weeks. My load out will be built around the Maxpedition Fliegerduffel Adventure Bag. I'm an EMT so I'll have various medical related items stored/attached via pouches to the outside of the Fliegerduffel. Despite these attachements I'll still maintain the airline carry on requirements with the exception of one bag I feel is pretty important.... The Maxpedition 10x4 water bottle holder. One of the main challenges of going to Africa is clean drinking water, so here is where I'm seeking the advice of all of you. 1.) What bottle/filtration system should I get that will fit in this bag. 2.) How can I attach the water bottle holder to the Fliegerduffel in a way that it can be quickly removed so the bag will maintain its carry on dimensions? 3.) Also looking for a metal cup that can go at the bottom of the water bottle compartment.