How much land do I need?

So I am not trying to be cheap per se. I have been looking at land in east Texas. I want acreage. I would like 40-70 acres but that's like a half a mil or less, whereas 20 and under is about 100K. So I need help figuring out how much I need. Farm wise. I want to plant a "Canning" orchard. I have been told 2 trees per person of what you want. Like Peaches, Apples, etc. The same with nuts. So maybe 40-50 trees. My son insists on animals, so a couple horses, a couple cows named Stew and Steak. A herd of goats, a few sheep. A couple coops. And if I have to dig one a .25 acre or larger pond. I plan on cutting silage for the animals during the winter.

So the math I have is 1 acre per large animal (Horse, Cow) so there is 4. I can get I ton of silage per acre. So cutting silage can feed them during winter. A cow needs 1 ton which will last 90 days. 4 cuttings from spring to fall. So 4 tons per cut acre. What am I missing?

So brethren. What is my minimum and maximum. I just want to be self reliant.  

Sean

I like 20 acres because if you can plop your house in or near the middle, it puts you far enough from the neighbors to feel private.

In Texas it's important to find out what the minimum acreage is needed to qualify for Agricultural tax status.  Every county is different.  In my neck of the woods, one can save half or more on property taxes by qualifying for Agricultural tax status.  https://comptroller.texas.gov/taxes/ag-timber/