I have never seen or heard of this being done. The water on board is at least as safe as at home. And their utensils are cleaned and sanitized very well. You are far more likely to pick up a bug from handrails or grocery shopping in your own town. Just wash your hands routinely on board the ship. Regular soap is fine, but wash long enough to sing Happy Birthday under your breath. No, the soap isn't aging, it's just an easy way to time it. The hand sanitizers are a good addition, but even they won't kill viruses the way old fashioned hand washing does.