Food & Meals:
Drink only bottled water (pay attention to the caps, they may be false) - a one-and-a-half liter bottle costs LE 1-4.
At the entrance of the Valley of the Kings they price water for 6 LE - you'd better take your water there (Born's remark)
Dont miss the biscuits (especially if you are someone who is devoted to sweets) - it remains fresh for days so you can pack it in for longer trips.
Carcade - this is a kind of tea, which is made of the flower hibiscus. Some like it hot especially if it is hot - but it is excellent refreshment with ice-cubes too.
ESzAHs favourite: Sahlab: hot milk + coconut milk with coco filings and raisin - sounds good? (Available in most of the local pubs)
McD, KentuckyFreud, BurgerKing you can find only in the largest cities but Coke, Fanta, Sprite are widely available.
...and often cheaper than water! (Born's remark)