Here's what I've been doing (and teaching):
Start with 3 mini-dropper bottles. Two of them are labed A & B, the thirid is labed MIX. I keep 'em together in a little plastic ziploc.
Re-Cant the Aqua Mira A & B in their labeled little bottles. In the morning BEORE traveling, mix up half and half in the MIX bottle. Wait about 10 minutes before treating your water. (* see below *)
Now, the stuff in the MIX bottle will remain "active" for well over 24 hours. So, there is no need to mix it each time. Just use it during the day. I had a fellow from the AquaMira parent company guess that it would last about a week in it's mixed form, he agreed that 24 hours is a very safe and conservative amount of time.
If the mix is even a little bit YELLOW, it's safe.
Now, you have freed up a bunch of time and hassle when treating water, no need to continually mix on the trail. And team mates can MUCH more easily share the drops.
(* continued from above *)
THere is a extra bit to know.
The "recommended" 7 & 7 should equal 14 drops per liter. It gets tricky because the little hole in the min-dropper may be a different size than the AquaMira package, so I'v found that if you put 14 drops (of A & B) in the mini-dropper, only 10 drops will come out and then it's empty. So, you need to test this ahead of time.