The first basic mantra is to drink plenty of water during your entire stay. You will indeed be benefitted if you consume water throughout the day, even if you are not quite feeling thirsty. It will certainly help your body to cope up better with the sun and allow you to retain body fluid.
Another trick will be to lie down low when the sun is very high on the sky or to take rests in between your sightseeing. Those who plan an Egypt tour from USA often choose to use the theory of ‘short sightseeing with intermittent breaks’ instead of ‘long sightseeing without a break’. The break does not imply that you must return to your hotel rooms. You can sit at any eatery, restaurant or café and catch a breather alongside sipping into some drink or food.
An Egypt trip package can be booked very easily and economically these days. So, once you have got over your fear of dehydration, you can flip through these packages and book one for your family.