Except for using up existing supply, I would highly recommend using chlorine dioxide in solid (tablet) form rather than liquid. Here's why:
1. Solid form has a higher concentration of the active ingredient than liquid form. Micropur, for example, is effective against all 3 classes of baddies: bacteria, viruses and protozoa (e.g. cryptosporidium). Normal treatment time is 20 minutes — but can take 4 HOURS if water is at near-freezing temp. In contrast, Aqua Mira liquids are more diluted (weaker) — and despite years of trying, AM was NOT ALLOWED to advertise effectiveness over viruses or protozoa, regardless of treatment time! Read your AM liquid instructions and you will see that ONLY bacteria is mentioned! Believe me, AM would love to mention bacteria and crypto if they could — but they couldn't! Finally, just last year (or was it early this year?) — AM finally came out with solid tablets.
2. Solids are easier to use. All you need to do is drop in one tablet per liter or quart of water. Or break a tablet into two and use half to treat 16 oz. of water. No need to count drops or mix chemicals or risk spilling.
3. Solids are faster — Solids don't need to be mixed, and there is none of the 5-minute premix wait as with liquids. Beyond that, actual treatment time for bacteria and viruses is the same 20 minutes as liquids. In near-freezing water, solids will need up to 4 hours to kill protozoa — but remember, liquids are even more ineffective!
4. Solids are cheaper — especially if you are going to quadruple the amount of liquids to match the effectiveness of the tablets.
IMO, Micropur and the newcomer AM tablets are comparable. And to me, both solids and liquids have an unpleasant taste — so that's a wash there.