When DD's were small, we took a soft sided cooler into the parks, with juice boxes, carrot and celery stick, and individual ranch for dipping, uncrustable, teddy grahmans, goldfish, raisins. We would keep it with the stroller, so no running back to the locker for snacks and such.
As they got older we, cut out the cooler, and used small back packs, with breakfast bars, granola bars, gold fish, bottled water, and use the small pour in's of crystal lite, gatoraid, koolaid.
Here are items I would keep in the room, poptarts, breakfast bars, fruit cups, or fruit, grapes, bananas, apples, milk, juice, Bread, peanut butter and jelly, chips, bottled water, soda, and gatorade. The peanut and jelly was a life saver late at night when the kid's where little when we would get back to the room they would be starving all of a sudden, this was fast and easy.
Now when it's just DH and I going
, Here's what we take for us, bottled water, gatorade, juice, soda, adult beverages. We bring along, deli meat and cheese, crackers and cheese, olives, pickles, fruit, some type of breakfast bar. We use a cooler in the room, and have a softsided one for poolside. I have a plastic bottle it has one of those freezy stick in it that we pour the wine in for pool side. No glass at the pool.
We always stop at publix, over by the outlet mall near DTD and load up, we drive, But I have friends that fly and use a car service with one stop and they stop at publix, and grab what they need. If you go to publix on line you can pick your store and print a list by aisle, so that your in and out in a flash, I even have brought coupons along just attach to the list.
Have a magiaclly time