My NRCS officer in MS told me I could qualify for up to $9,000 for a 30 X 70 high tunnel. They have a list of suppliers, but I could use my own contractor or build it myself. You have to meet certain guidelines, but a 2,100 sq. ft. high tunnel could be turned into a significant commercial operation if you are near adequate selling markets.
You can also get a
pond put on your property (must be used to
water livestock) and livestock fencing, as well. You need to first register your property with the Farm Service Agency as a farm. It's a simple process, and you can qualify even if you're just
gardening for your family.
If you call your
local NRCS office, you might get someone to come out and walk your property and give you ideas for your homestead/farm, and they'll tell you about other resources, including technical advice, that's available. I have a small pond already and there's not a good one for a second pond, but my NRCS officer told me they would "get water to your livestock" via a pipe and trough or some other means.
Check out the USDA EQIP grant programs, as well.
https://www.nrcs.usda.gov/apply-for-environmental-quality-incentives-program-eqip
Good luck.