MSR SweetWater ViralStop
Price Paid: $9
I use a water mechanical water filter but if the water I am filtering is real nasty or questionable I use these drops also (just in case). The bottle is a bit on the large size for a minimalist, but usable. Also it has no nasty iodine taste and they work in only a few seconds, unlike some treatments.
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Here's what other sites are saying:
MSRs SweetWater Purifier Solution is a chlorine-based purifier solution that provides simple and fast virus protection when used in conjunction with the SweetWater Microfilter.
- Ramsey Outdoor
SweetWater ViralStop eliminates bacteria, protozoa, and viruses to effectively purify filtered water in a mere 5 minutes.