Cast iron is heavy but it saves lots of propane
because of it's great heat retention and it is so easy to clean!
Buying the pre-marinated meat or skewers from a supermarket is a good way to cook your own food without prepping it.
If you have separate spouts for grey and black tanks, you can drain grey water into a 2 to 5 gallon container and use it for flushing the toilet when boondocking
. Saves freshwater and reduces grey dumps.
When running the water to get it hot, run it into a 1 gallon pitcher and save the water for washing or flushing.
In a pinch, a bungee cord can make a great paper towel holder. Different size bungee cords are very handy!
Decide where you need storage, measure and then buy plastic bins/containers/drawers from the hardware store or the container store. Don't buy before you measure!
Suction cup hooks are very useful.
Burt's bees makes makeup/oil/dirt wipes that are a pretty excellent alternative to a shower. Robot Check
These Kelty cache boxes are great for all sorts of things that need to stay put and protected in cabinets: Robot Check
7th generation thymol wipes can be used on dishes and food surfaces without wiping-- you can sanitize with a wipe and eat.
"Miss it twice rule" (thank you PRTexas!) - if you haven't missed it two times, you don't need to buy it.
This post will likely be edited as I think of other things, haha!