How to prevent snorkeling mask or goggles from fogging up in Egypt?

Anti-fog liquid works great against fogging: apply one drop to each lens, rub it in, then rinse. If you don't have anti-fog solution handy, saliva works just as well.

Hotel glasses are usually washed, but quality can vary. Many travelers bring disposable cups — they're lightweight, require no washing, and can simply be thrown away after use.

Based on past experience, hotel glasses were fine, though some reviews mention complaints. Guests in April–May and November reported clean or new glasses. If in doubt, bring your own.