I met your son this evening. Nice kid, I enjoyed meeting him. I haven't been called "Sir" so many times in my life! His courtesy and thankfulness was center stage [not needed, but still appreciated].
Here's what I saw (the Jeep's back at his place now):
Checked the oil - looked clean, no water issues, no bubbles, no haze. Clean, mid-change oil. It was a tad high but he said he had filled it / topped it off when having problems with it and it was sitting on a "slight" incline with the dipstick at the low end. Other than being a tad high there was no indication of water in the oil. The underside of the oil fil cap was clean too - no gunk or odd colored sludge. Opening the rad cap - no fluid and what was there had more brown than I'd care for, but perhaps that's just my illusion for not "seeing green".
In went some water and the drips to the pavement started. Drivers side of the block, right at the front. I couldn't see more than that (dark, only a flashlight). Hopefully it's only a water pump. He got ready to start it and I dumped in the water. The motor sounded nice and even (no missing cylinder), a motor w/o any issues aside from the copious drip. About 1 gallon until full. The plan was to run no more than 40mph and to stop at the first gas station 1 mile away for evaluation. At the gas station we were able to fit only 4/10ths of a gallon into it. At that point we skipped the in-between gas stations and got it back to it's parking spot (~5 miles total).
From there we let it sit and went for two gallons of straight anti-freeze. This week is looking to be a cool/cold one and it may be several days before it gets worked on. I'd rather not give him a cracked block from the water we put in. Back with antifreeze, we went to the gas station to put more gas into it and I dumped in straight antifreeze. We (me following) drove 1/2-way around the block and put a mile or so on it and stopped to fill it again. Dumping in the second half of the first gallon. Back to his apartment it went and now sits (dripping coolant). Hopefully, with the coolant cycled through it will dilute the water enough to ward off a cracked block. It's sitting outside. If you think a cracked block is a concern, my garage is 4 miles away. It could be put in my garage for a few days until a decision is made.
Edit: At the first stop I put the backside of my fingers on the right side of the block, rear cyl. It was still just warming up. At his apartment I could hold my fingers to #6 for only 3-5 seconds. The thermostat had opened and the top cover of the radiator was warm. I asked him to keep the heat blowing on high and to tell me if any heat was noticed - only at the last portion of the last bit of driving for the night did he say he felt heat.