Anthony, lot's of good advice already given. Also, if you find a piece of property that already has a pond, you can hit Google Earth and go back in history. That can help you see the water fluctuations over the years.
I'm not sure what part of East TX you're looking at, but there are lot's of area's with sugar sand. IMO, looking at a pond in late summer or fall will give you a better idea of it's water holding potential. Right now, lot's of ponds are at or near full around here because of the spring rains. That may not be the case in 4-5 months.
Good luck, and let us know what you find.
