The following is included in the download file:
I adjusted the hunger fill to be a little over 1/3 of what you would get if you ate a salad for sims on an Off-the-Grid lot. If a sims eats a harvestable on a normal lot it will be half of that.
I increased the Vampire thirst fill for the plasma harvestable by the proportionate amount.
I also made it so that when a sim eats a harvestable off-the-grid it fills their hunger twice as much as a normal harvestable. That way your sim has a better chance of living off the land ;)
You can pick if you want to use just one file or use them all!