ya gotta do this "celebrity style"
like all those hollywood types trying to "raise awareness" by "living" in some poor village for a week, or somebody trying to sell their "save money on food/power/gasoline/etc" system...
First, spend a whole lot of money buying enough land or supplies. Buy an expensive solar installation, get your job to allow telecommute for two weeks, whatever angle you're into.
Then start a garden, charge your batteries, stock away your supplies in your TV crew caravan. Then, for the purposes of the "experiment", start the cost counter at zero.
then live off of your "inexpensive" and "free" food or spend nothing on supplies. Claim "Great Success!" or "Mission Accomplished!" before supplies run out. And bask in the glory that you "spent nothing" (this week) on gas or electricity, and "survived" in a poor village before running back to your high roller expensive consumption lifestyle.
But actually starting from scratch without undeclared upfront preparatory investment? What do you think you're doing? You'll set an actual "standard" here...if this gets out of control, advocates and celebrities might have to make actual sacrifices like those they claim to be representing or aiding!
(Now what's your agent's number? Im thinking we sell your challenge as a new fad diet...we'll make millions of your real money! We can even skim a percentage off the net for your cause, I got Jolie and Clooney's people on standby...) :)