Take regular energy stops on your walk to share some homemade granola bars, or stock up on some healthy, kid-approved snacks. Two pieces of advice: leave anything chocolate at home if it's hot out (or else risk a melty mess!), and don't bring food that's hard to pack or eat outdoors. You want to teach your kids to leave no trace, but you also don't want the inside of your bag to be a yoghurt-covered mess. Fruit, veggies, or string cheese are all great options.