Hi Maggot,
Interesting discussion. Thanks for bringing it up.
For those who still may have reservations regarding this matter...
My first thought is to have three breast milk bags. Dissolve one Potable Aqua tablet in one, then divide the contents evenly into the three and fill them all. This approximates the correct dilution. If you don't have three breast milk bags, dissolve one tablet into one bag, pour two-thirds of it out and fill it full again. It's wasteful, but better if you (or someone else) was really concerned about concentration.
My second thought is that I really need to go try to split a Potable Aqua tablet into parts with my Micra to see how hard it really is.
My third thought is that David's fish bags (or oven bags) might be the better solution for kits that have room for them.
Stay safe,
J.T.