Hi Jayne,
Each airline and airport will have its own rules but, generally speaking, they tend to advise you to carry extra carbs in case of delays so you shouldn't have any problems. (Give them a call or check their websites for specific rules/advice). Dry snacks will keep better in the heat but pack in between clothes to prevent them being a pile of crumbs at other end! Haven't been to eygpt so will let someone else advise on specific foods allowed/not allowed...
You can't take water/juice into airport but can buy it in airport. We also bought water on plane and no-one stopped us taking it into arrivals. You can buy snacks on plane but a friend swears by the 'meal deals' in the airport - tastier than the airline's offerings and a fraction of price!
My tips...
- get a letter from doctor confirming your daughter's diabetes (and any other medical conditions) and stating she will be carrying insulin / snacks etc. (No-one asked about my insulin etc going through security, or asked for this letter but it was one less worry knowing I had it if they did ask)
- you can never pack enough glucose tablets! put them in your hold luggage / hand luggage / her luggage... that way if any bags do go astray you won't be stuck. They don't weigh much or take up much room. Likewise, pack some snacks in each case.
- take plenty test strips and check her sugars regularly. I found the heat cut down my insulin requirements quite dramatically - I ended up skipping lunch time jags completely some days, despite eating my normal carbs.
- consider getting a frio pouch to keep insulin cool - I got one a fews years ago and its brilliant. you just stick it in water for a couple of minutes to recharge it. Had a bad experience with insulin "going off" in heat once - was taking double quantities, no carbs and sugars continued to escalate... never been without my frio since.
- also consider getting a picnic rucksack for one of you to take on as hand luggage - again, to keep insulin cool. Airplane was freezing one minute and roasting the next, and they advise against putting insulin in hold in case it freezes. Was handy on holiday to keep lunch/snacks/drinks cool when we were out and about. Take out the knives etc before you go though!
- check your travel insurance, you might need to declare / pay a surcharge for your daughter's diabetes. We have free travel insurance but they only offered an annual price to add diabetes - about £70 I think. Hardly ever go away so had a quick phone round and got a one off policy for about £20.
Hope you all have a brilliant holiday!