Yes, it will cost you time at the gate. It will need to be checked by security.
To the Magic Kingdom, yes.
To the board walk yes. Not restaurants or dance clubs
You can take in snacks, much easier in a backpack. Every bag will be searched. No ice is allowed now. New rules were just put in place what 2 weeks ago. Bottled water is 3.50 but there are plenty of places in all the parks to get water if you ask.
Yes
Yes you can. But it will get checked. Water is free at different places or you can buy for 3.50
Yes you can.
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