Here is a link to oil and gas wells plus some water maintained by Texas Railroad Commission. I became familiar with it when buying property in Brown County. A few places had old plugged oil wells on them, which were nothing more than a 2” drilling pipe sticking out of the ground.
I’m seeing a couple of canceled abandoned ones just outside Medina and 1 active. But if they are 2” drilling pipe, that’s going to take a lot of effort to dispose of a body.
Abandoned hand dug well would be large enough but most of the ones I’ve come across have been filled in for safety reasons. Could you put a body in one and maybe raise the cap a few feet unnoticed, I imagine so but you couldn’t pour concrete over a body and have it dry flat.
With the drought, I’m not sure how full the animal stock tanks are in the area.
A 5 gallon bucket, a body and a sack of quickrete and a tight timeline.
I would think a 55 gallon drum or a suitcase or something to encase the body, mix the quickrete in the bucket, dump it in on top and let it cure in place after disposal, maybe a duffle bag if it was large enough. Even a tool box that you have in the back of a truck would work. Most of those would require premeditation to have it at the site since it wasn’t in the back of his truck. It does feel watery in execution, concrete to hold it down, I don’t think a single bag would cover an entire body efficiently based on what quickrete work I’ve done in the past and you can’t put a full size human in a 5 gallon bucket, at least not without quite a bit of work.
IMOO