Potato doesn’t keep long, but it’s cheaper than rice.
Been thinking a lot about this topic lately, since we’re about to become empty nesters and ditch the McMansion. If you play your cards right, you can find a Class A RV diesel with < 100K miles on it (a baby, for a diesel) in full working mechanical condition and very minor cosmetic needs for 30–45K. You can buy a smart car or some other microcar used with relatively low miles for under 10K to tow behind it, or just get a Vespa and rent a car when you really need one.
Add to that your simple food budget, and now you’re living cheap. 500 bucks per month in most places gets you a place to park your RV, water, utilities, internet, and maybe you chip in 20–30 bucks a month into the commmunity kitty for electricity.
Want to take a month long cruise, just move your RV into storage (<100/month) while you’re gone. You're living luxuriously, just on the cheap.