What water bottle are you guys using? I'm kinda of a hoarder when it comes to water bottles... I have Nalgene, Camelback, Hydroflask, Klean Kanteen and Tekeya. Lately I been using the GSI Microlite and its excellent and I just ordered a Zojirushi to compare. Looking for light weight, no sweat, no gulp/chug and retains ice.