Theme Parks are known for many things, but reasonable prices is NOT one of them. So, unless you want to leave the park for meals, pack a little something for your family to eat inside the park, you know, so they don't starve or, heaven forbid, whine.
There are lockers available just outside of the Disneyland entrance where you can stash your snacks, or you could carry them around with you until lunch time. Supposedly, Disneyland has a policy about not bringing in food but we brought food into Disneyland every day, including obvious, plastic water bottles, and never got stopped at the bag check.
Even with your superior planning and foresight, it will be hard to walk by every single food vendor with out indulging. Around 2pm, when you've been seriously attacking Disneyland for 6 hours, your sugar levels will start to falter and you might feel lightheaded. It's possible your pre-schoolers just might be tired of trekking all over the park and need a little break.
At this point in the day, you will gladly pay $3 for a few teaspoons of sugar in the form of cotton candy. More than that, you should pay $3 for cotton candy. And don't feel bad about it either. Cotton Candy will give you a chance to sit for a few minutes. Everyone can share in one, $3 cone of cotton candy and feel like they are getting a substantial snack (if your group consists of one or two adults and a few small children). Most importantly, the sugar rush will give you the energy you and your kids need to get through the next six, fun-filled hours at Disneyland.
Cotton Candy vendors accept cash only, so make sure you have $3 with you at the beginning of the day and you will be ready for your cotton candy break later in the day.