Lots of good updates already on why the lifestraw isn't a good choice for something like this as a PRIMARY source of water purification. Biggest reason for ME is how much water I need daily when backcountry elk hunting. Ive hunted in September in 90+ degree weather, and doing several thousand vertical feet a day up and down in temps like that, even under normal September temps, can make you go through almost a liter an hour (again, my experience). I may leave camp at 430 AM having already topped off my 4L worth of water in my pack, and not see water in a small creek until 11AM. When I find water, I fill up my bottles with the pump filter unless I'm on a stalk. I prefer 4 x 1L Platypus soft bottles over camelback types with a hose. I can't stand those, and that's just personal preferences. I usually have an empty rolled up bottle (weighs an ounce or two) in my pack for dirty water. If I don't have time to filter, etc... I will throw in dirty water, and drop an iodine tablet in on the move. Once you get a lay of the land, and see how your daily hunting is, you can fine tune your water to weight use. Example, the place I hike into to setup camp is only 2 hours, and on a nice trail. I don't need a lot of water for that, so I pack in 1 bottle full to where I set up camp on a lake, and fill up the remaining 3, and top off the 1 I used to hike in with my pump filter. Saves me 6 pounds on the hike in. I know where I dive off for elk in the morning, I hit a creek at the bottom, and I always go there before calling. It takes me an hour to get there. So I may dive off with 2 bottles full to save weight, and top off with filter, etc... Once you know the lay of the land, you can learn how you hunt it. Also, mark your water points for both hunting and survival. When starting out in a new area, make sure you have enough water for the temps. I always have extra rolled up platypus bottles either at my tent or in my pack. When it's chilly I may not need as much, and when it's crazy hot, and water holes are scarce, I may fill up an extra one.
Always drink way more than you think you need before bed. After two or three days of hard hunting, it's really easy to get dehydrated and have headaches and feel like crap in the AM. Especially with altitude gains. I pound a liter of water, and usually a liter of hot tea from my jet boil before bed. Even when using the jet boil, I am pouring filtered water into it. This way, my water boils in 100 seconds. Otherwise you would have to boil for 10 minutes to guarantee killing the bacteria before consuming. This saves weight on fuel as mentioned previously.
A lifestraw is a valid backup, and I always have one in my truck. When hunting like this, my primary is a pump type filter, and backup is tablets. I take enough tablets to be able to use them for every ounce of water I will need to consume if my filter shits the bed. Tablets weigh next to nothing and can save your ass. I used only tablets for the entire month of August while going through SERE school and had no issues getting sick.
The way I understand, you are planning to fill up dirty water in your bottles or camelback, etc... and use your lifestraw to drink from the dirty bottles. While this may work OK at first, generally flow rate decreases fairly quick as it begins to get dirty. Pulling water from fast moving streams and things can help delay this however. You could get by on a trip like this with one, but it's a lot more work for you. Drinking a liter from a bottle and a liter through a lifestraw is significant time difference that over time results in you taking in less and less water. Then for boiling water for mountain houses, the way I understand it you are planning on using dirty water to boil, and boil for 10 minutes to kill the contaminates. Again, this works, just adds time and fuel weight. When I get back to the tent, I have about enough energy to eat and take my boots off.
Can you get buy on this whole trip with nothing more than your lifestraw, absolutely. Are there more efficient ways to purify the large volume of water you'll need to consume in an 8 day trip, absolutely. Best of luck. I recommend buying a lifestraw, and testing it out on a few hikes. Hell, use it for 8 days to drink every drop of water you consume. It may just change your mind.
. Elk are awfully big critters. 
