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There are a few go-to snacks that I like to bring to the parks with me when I know I'm going to be a while and I don't feel like spending money.
Same goes for bottles of water; they're about $3 in the parks, so it depends on what bag you're bringing, how long you're planning on spending in the parks, and your food budget if you bring it or just buy a whole case at the grocery store and pack some in your bag. You can also get free cups of ice water from Starbucks and snack stands.
You can also get some portable measuring spoons as well, which come in handy for measuring things like coffee creamer or when you bring your own PB2! They also make measuring spoons that act as a digital food scale, and this way you're only carrying one around (and will be a great little tool to have at home, too!).
Looking to meal prep a little bit more? You can get reusable containers to pack your meals with you if you don't want to use plastic baggies!