Where are you going ?? There are very few places left in the world where it is a real problem.
I use Lifesystems tablets. I stash enough for about 20 litres. That would cover almost any eventuality between shops, petrol stations, hostels etc.
A rolling boil for two minutes will kill any bugs and parasites too.
It's only in contaminated water supplies that you really need to filter as there could be heavy metals in the water etc.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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