Transmission not shifting properly and engine is overheating

A couple weeks ago truck was put into reverse and when shifted into drive it would stay in reverse. The shifter transmission cable came off. It was put back on with zip tie and was fine. Two weeks later we could not start truck without a jump we were driving and the truck would not go more than 20 mph and shifter would slide up and down fast. Cable came off again. We put back on and seemed okay for about five minutes then it down shifted to 20 mph overheated steam from hood and cable off. Put it back on and it shifts into gear but goes forward about three feet and stops moving forward engine stays on still. We have to keep adding water to radiator every few days or it will not start. There is a squealing sound like a belt under hood that lasts few seconds. The transmission cable is on and shifts into gear for shifter and underneath it just will not drive forward or reverse. Stuck four hours away and have no money so I am sleeping in car.