Nail airbrush designs will only last as long as the topcoat or gel applied at the end of the service does. The airbrush design is sandwiched in between the nail and the topcoat. Safe Airbrush ink is not able to stand alone, so as the topcoat (protective covering) wears off, your airbrush design will begin to wear also. hope this helps.

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I think that depends on how you are camping. I have done some tent camping, and for longer trips it can be difficult to keep foods cold or frozen so they don't spoil. Dried goods are great as they don't spoil so easily, and you don't end up with water logged food after the ice melts in your cooler. Some ideas are canned soups, canned vegetables, granola bars, trail mix, muffins, fruit snacks, fruit, nuts, etc. Fruit juice is good too since it won't go bad if it's not in the fridge (although i think it tastes better cold).
If you are using an RV pretty much anything goes since you will have your own fridge and freezer- no ice needed!
I hope that helps. Have a great trip!