Ok, IMHO...
The water is simple. Have the city activate the meter, and we tap into the end of the line. There is probably already a connector in place. If not, it is a quick hop into town for parts.
The line itself should be PVC if and I mean IF it is to be a permanent line. This means it must be buried soon after being glued or a dumb cow is going to crush it one day.
Installing and burying lines, while it sounds noble, is a heck of alot of work. No matter how motivated we are while sitting in A/C in front of a keyboard, it is going to be terribly hot, dusty and exhausting.
300 yards of dry Texas sod is not going to be a simple chore. It will take all day+ to do this by hand.
A quicker approach is the water hose relay. Roll the hoses up when we are done, and ETH can trot them out each time he goes to the cabin.
Or, leave the lines in place, in the shade if possible to avoid UV damage. Turn the water off in the fall and let gravity drain the line.
Plans can then be made prior to the Fall HUNFUNSUNGUN to rent a ditching machine and bury a permanent line.
Since there is NO power on the place, we don't have to worry about it. We run the margarita blenders from a generator...
BTW, I have at least one drinking water safe line I can bring as a donation. 300 yards means alot of hoses. I doubt there is a store in town that stocks 300yards of hoses.
We need nine 100 foot hoses. I think I have a 100 foot hose (it might be 50) that I will gladly donate.
TheRedGoat