I carry a Hydrapak bladder. The downside of bladders is that they’re not indestructible. I also carry a filter of some sort. I bought the Katadyn BeFree for last year to ditch my older MSR SweetWater and saved quite a bit of weight. I like the BeFree, it takes a lot less effort to get clean water, I can also fill it and take it with me somewhere giving me an extra 3L of water. If I went away from a bladder I would go to something like a Platypus Platy collapsible water bottle. Now, with my bladder, I typically carry another bottle with me so I can make a flavored drink of some sort during the day too.