I always carry a purification straw for quick use, and a bunch of water purification tabs as a back up to that. Boiling water is usually not an option as the space needed for a stove is better used to add a few more mags of ammo. At home I carry a lot of nice luxury items while hunting etc but when deployed size and weight are a huge factor. As such, my survival kit is reduced considerably to make room for mission essential equipment. The water tabs the army issues are great(micropur mp1) but as each one is individually sealed they take up a lot of room in my kit. I carry at least 20 on my person plus more in the LAV. The problem is that depending on whats going on and the level of exertion it is not uncommon to drink 10-15 L of water a day in that kind of heat.(so 20 tabs wont last very long) It is easy to fill a bunch of bottles from a water source and place them on top of our LAV where the sun will beat down on them. Then if resupply is not avail then at least we have a backup plan for water. I would only attempt SODIS as a last resort if I had to, but on my last tour I learned the hard way that resupply does not arrive on time unless you don't need it(lol) I am glad that I could use SODIS as a backup until it does arrive.

Thanks for the replys so far.