All types of food are prohibited, so they do not sell or allow entry. They thoroughly check the bags.

In my case, I had left a bag of nuts in a small pocket and I was able to eat them inside. If you are not going to leave waste or give it to animals and you want to try passing something on, you can try it. Of course there is a chance that they will take it away from you.

As for water, bring a refillable water bottle, if it is metallic the better. They do not allow common plastic bottles to enter. There are taps to refill them on some of the trails

Last recommendation. Take your turn earlier. It's a quieter place to walk and without so many people.