Cold spray is very difficult to use safely if you have not worked with it and is not recommended. In almost every use, direct application of ice or a freeze pack is safer and easier to use. Be sure to ask parents if the kids are allergic to bee stings and have them give you extra EPI pens or Benadryl for your kit. It is always preferable to have the parents in charge of these items since they know their child's condition better than you do. The plastic sanitary shovel is for filling ankle-breaking holes and divots and for covering sprinkler heads.
Plastic helps get past airport security without questions.
Witch hazel pads, in an alcohol solution, are an excellent in the field tool for cleaning wounds. They are also good for quick relief of bee stings. The baby powder, sprinkled on skin, on the sock, and inside the shoe, prevents blisters better than any other protection in most weather conditions. Use tape and a brace instead. Blankets, umbrellas, and tarps are also useful.