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big no on gore-tex. You will have many wet days where you want your shoes to dry out as fast as possible (you will still get wet even if they're waterproof) and goretex wont allow that. Also probably...

As said, it depends on the place. Some may ask you to leave it outside and it will be obvious, often posted outfront. But if you're doing a resupply, most big name grocery stores I just bring it in...

I used the 1.25 oz bottle of deet, and it lasted me my whole thru. A little goes a long way