It costs about 4 k
You get borehole and pump at bottom to pump up output pressure up to 8 bar adjustable.
No licence needed unless you use more than 20,000 litres a day and no more water bills 
I know everywhere is different but we used to use a borehole to fill and topup the pool we had in Pretoria. Our borehole was into granite and the water pumped from it had to be tested to ensure it was safe for human consumption.
Once we got the approval, we found it was so heavy in metal deposits that the concotions needed to neutralise these were more expensive than just filling the pool with water from the municipal supply and paying for it.
The lawns loved it though as did the gardens.
Added: My folks also had a borehole. Their home was in a valley with a lot of clay. The water was a milky colour and so full of minerals and stuff that you couldn't clean the car with it.
Spruce