Use in underwater camera casing
Indeed Underwater Camera Casings is a lot of fun. The fog or streak across the lens can ruin the camera even if stray moisture or condensation will not. You can get rid of this by adding a few silica gel packets, say one or two in the underwater casing, along with the camera.
Random detail: We know it is not fun to get worried about ingesting the silica gel accidentally, but know that even if it happens to you, your children, or the pet, by all indications you will be alright.