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How to de-salinate seawater when stranded on a deserted island

Step 2Make a berm out of beach sand

Make a berm out of beach sand
Survey the beach. You will notice a definite difference between the sand that gets pounded by waves, and the dunes that don't get wet no matter what time of day.

1) Pick a low spot at the edge of the dune/wet sand border.
2) Lay the sail down on the sand and spread it out flat.
3) Trace the size of the sail on the sand.
4) Dig a trench approx. 2 ft. inside the traced triangle, and place the excavated sand within the 2ft border (inside the trace), and place some sand in a pile in the middle of the triangle.
5) Keep digging until there is about 2" of water in the trench.
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"Better to have it and not need it than to need it and not have it."