Better get a solar powered freezer then.
On the other hand, a water bath canner will take care of the favorites: Tomatoes, fruits, jams and jellies, pickles. Green Beans can be preserved by hanging and letting them dry.
The used to call them leather britches or some such. In Missouri grains can be dried in the sun. Don’t know about Texas you have more humidity I think. Once dried enough, grains can just be stored in sealed bags with dessicant.
Root veggies can be stored in the ground or in a cool basement corner or maybe a garage.