$25 will get you a Sawyer Mini https://www.amazon.com/dp/B00MPH1LEU
or a LifeStraw https://www.amazon.com/dp/B006QF3TW4/
I use a Sawyer Mini. Threads onto a pump bottle / coke bottle, and can also be installed in-line on a Camelbak hose. Either way, it allows you to fill your water storage with 'dirty' water, and drink thru the filter on the go. The LifeStraw is exactly that - a straw. You need to suck from the dirty water source.
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