The information you are looking for probably can be learned through the local agricultural agent. There probably is a well on your site. The county can help you find that if the real estate agent you worked with doesn't have that information.
You don't want to bring in water by the bottle, even the big bottles. Very expensive. Most of the water people I know are doing residential and commercial irrigation service. You might ask the ag agent if he has a list of system servicing companies. One of these would be able to refer you if they don't drill.
On the other side of the mountain, Alamosa taps an underground water source. Until recently, that water was drinkable without any filtration or treating. Try those sources. If you're still not finding what you need, visit a local bar and strike up a conversation with the locals. Businesses still advertise in the Yellow Pages ...
Hope that helps.