Also may be used to create power for a 3 Volt mini cassette or radio. Still in an open, damp place. 6 x 6 clear plastic sheet over a hole in ground, place a rock in center to weight, bucket placed under plastic in hole collects water evaporated from ground. Add vegetable pieces, collects about 1 qt. Mineral water with cork and paper to send a message in a bottle.
Birds usually fly to water in early evening and morning.
Salt water kills 1-2 days faster than no water at all. A multi-purpose stainless steel knife comes in handy on your island. Comes with its own case. Don't eat fish without scales, irregular scales, tiny mouths, sunken eyes, slimy gills or with bad odor. Avoid if it is wilted, slimy, odorous.