I've had my MSR filter for 14 years and it has been great, but this year I've been messing around with the Sawyer Mini and the Lifestraw. The Sawyer is by far the best IMO. It does gravity and you can even squeeze it right into your water bladder or run inline. The Lifestraw tastes strongly of plastic no matter what I do to it.
None of these devices freeze well FWIW. Chlorine drops are your friend but allow 20 minutes of contact time before drinking.
None of these devices freeze well FWIW. Chlorine drops are your friend but allow 20 minutes of contact time before drinking.