A lot of discussions on conditions so I will present four of them and what I would bring for each. In each situation I would choose the first aid kit.

Warm climate, fresh non-moving water with plenty of firewood:

This is an idea place for mosquitoes and the water may need to be purified.

I need the tent to keep the mosquitoes out.

Matches for building signal fires and drive the mosquitoes away.

Water purifier.

Warm climate, fresh non-moving water with a lack of firewood:

Tent.

Water purifier.

Mirror for signaling.

Warm climate and a lack of fresh water:

Where there is a lack of water, there is a lack of mosquitoes and firewood.

Tarp for collecting rainwater and shelter.

Matches.

Mirror for signaling.

Cold climate with snow on the ground and no other water source:

Tent to keep warm.

Matches to keep warm, build signal fires and boil water.

Pot to collect snow to melt into drinking water.

Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday