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If you have a way to power a crockpot that's the way to go. You can make a weeks worth of meals for under 20 bucks and it'll blow the pants off any fast food taste wise plus much healthier.
Had to buy a new car recently so had to tighten the budget, was blow away with how much I was spending on food. Check this out
Have you ever considered using a crock pot? RoadPro for $33
She's wanting to boondock for multiple days at a time. It's one thing to run a heating appliance for a few hours, then charge up the battery again. It's another if that's the primary cooking device when off the grid for several days (without either running the vehicle or running a generator or hooking to 120v for a top off).
uses 8 amps. Unless upgraded the RV battery is probably somewhere around 100 amp-hours (AH). You don't want to run the battery below 50%. That's 5 hours of use (assuming 100% duty cycle). At 20% duty cycle, that 25 hours of use, if using power for absolutely nothing else (no lights, no running the heater, no fans, no laptop charging). That simply isn't a viable boondocking solution.
I'm not arguing that using a 120v appliance (with an inverter) is more efficient than using a 12v appliance without an inverter. I'm arguing that a crock pot run only on a battery is not workable for her stated purpose.
You can pick a relatively cheap 2 burner camp stove. Might not be practical for "wild camping" backpacking a distance into the wild (though I've seem people lug these things back into the Boundary Waters of MN - quite a luxury once you've set up camp). Single burner back packing stoves aren't all that expensive either but you give up the flexibility of being able to boil water and fry something at the same time that you have with a two-burner. Obviously you'll need a couple pots and pans and utensils and stuff like that. A wash basin is also a handy item.
Another option for showers is to check into local community pools or city/county parks on lakeshore beaches. They often have showers, sometimes free but usually not that expensive of a fee to enter the pool for access to the showers. Otherwise, wet wipes work.
Bring clothesline type rope for hanging things up to dry. Duct tape has many potential uses. If you plan on really long drives, maybe a 12-volt slow cooker might be handy.
Careful about two person tents if you want to share with a grown adult. They can get quite cozy if you expect to have two adults and gear. Understand the tradeoff though on wanting something light for backpacking. Maybe a slightly larger tent for the car camping areas and a hammock for backpacking if you're heading into areas with trees.