Oral rehydration salts
WHO-formula sachets
Almost everyone gets a bad stomach day in Nepal and dehydration at altitude turns that from unpleasant into dangerous — sachets weigh nothing, and they are also sold in every pharmacy in Kathmandu for pennies.
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Do not buy this if: Nobody. Take six sachets.
Everything else we recommend in first aid, including the ones we think suit a different trekker.
Best base kitEVERLIT Ultralight Waterproof First Aid Kit
A sensibly stocked kit in a genuinely waterproof shell, which matters more than the contents list — no commercial kit contains what you actually need in Nepal, so treat it as a bag to add to rather than a finished answer.
The one to over-packCompeed Advance Blister Care
More trekking days are lost to blisters than to altitude, and hydrocolloid plasters let you keep walking on one — they must go on CLEAN, DRY skin at the first hot spot, not after the blister forms.
