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Of course, if you have a serious leak, fogging will be the least of your concern. However, silica gel can absorbed up to 40% of water relative to its dry weight. So a small leak that can cause fogging could be taken care of by silica bags.The amount of moisture that a silica pack can absorb is quite small, less than one drop, and in the case of a small leak, there's very little chance of damaging the camera. This is especially true of the TG series cameras which are water resistant. Many years ago, when we were all shooting Oly C5050 cameras, I would put cut up pieces of women's panty liners in the case which absorb many times their weight in water.
Nothing will help if the housing floods!