Ah, of course. Duh. Use a nice soft bottle. Expensive but light. And will last a good while with care. Maytake a little finesse to wave that thing around in there without spilling. Gatoraid adapter looks good too. Still not using one of those things :-P
"what do you use to filter water then thats light weight? the backup tablets i have take 4 hours. iodine tastes nasty. the other drops dont kill everything."
What we are talking about in most cases is giardia and cryptosporidia. As for the "non-sissy" methods of purification (non-sissy implies understanding and accepting that there is always a small risk of catching something that is, in the end, only a nuisance), I like Aqua Mira. It should work pretty well for these if you leave it for 30 minutes or so. But yes, 4 hours if you are very worried. Or you can crank the concentration if you are especially worried. Seems to be the vast majority of folks on here do the same. No taste at all (for me), unless you have an X-men super-tongue, but some people are very sensitive. Also unless you are subjected to one of my friends who once didn't listen when I gave him instruction and used about 5 times the concentration. Then it only tastes a bit "citrusy" to me. Most people who have a gripe about iodine, myself included, don't taste aqua mira. Clorine Dioxide is the same thing used for tapwater in most places, so you might already be semi-trained to discount any taste you might pick up.
I have used aqua mira many times on brown tannin-laced water from a trough or pond that had 10 inches of dead leaves on the bottom and bugs swimming around (a good sign actually). I keep a bit of noseeum netting to filter the bugs and "floties". There are some folks who are more anal (also sissies, LOL) who use a coffee filter. Main thing is that aqua mira should make it (reasonably)safe if you follow the instructions. What is a "reasonable" risk, I do admit, depends on the person.
Other than having to wait a *little* with aqua mira, it is great, especially if you don't demand %100 certainty (and are good with %99.999) unless there is a serious illness involved. You are done in 20 minutes or so depending on how "sure" you want to be. However, if you are going to the 3rd world with possible viruses and such, use the steri-pen (AND aqua mira and iodine for that matter) and go the full monte.
Full disclosure, I backpack a lot in the Sierra, so while exposed somewhat, I am probably spoiled a bit.