IMPORTANT SIDE NOTE: I'll say this... when going into areas where there is basically little to no water available to filter, or the area is new to you, so you don't know for sure if there is.... whatever the total amount of water is that you are electing to carry-in on your hunt?... Be sure to have it split-apart equally into at least two containers housing half of it if you aren't familiar with an area.
That way, if you find yourself sucking dry to the bottom of the bag, you know it's time to turn around and not go in any deeper that day. Also, if one container physically fails on you and develops a leak?, again, you know you have that same amount of water to get you back outta there.
Or at least do something like this until you get good at judging how much water you'll blow thru in a particular area for the time of year you're in there.
It can be an EXTREMELY serious situation to find out the hard way you just sucked-down the last of your water... especially if its at the bottom of a mountain and your vehicle is back UP at the top. On a hot and muggy October day. (FML)
If that situation does ever present itself, understand and realize that you may need to be patient and wait in the shade until sundown fully comes, to take advantage of the drop in temp. And that even with that drop in temp... it's going to suck more than anything in your life has ever sucked before. And that you will never take water for granted ever again.