Again, this only works with a small and inexpensive camera. It's a safe underwater camera housing that will cost about a dollar. You basically wrap the camera in a condom (or two).
1. Cut a cardboard tube (the inside of a paper towel roll should work) slightly longer than your camera lens at full zoom. This will protect the lens and make sure the plastic cover is taut.
2. Get an non-lubricated condom (no point protecting the camera from water while covering it in goop). Carefully unwrap it over the camera.
3. Put in a desiccant packet. Look in an old shoebox for the little silica gel packet that says "Do Not Eat."
4. Tie a knot in the end and put a dab of glue inside the end of the knot.
5. Repeat steps 1 and 3, if desired, as an extra precaution.