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This has come up before on this site - try the 'search' facility. I did a quick search on 'borehole', which threw up;-  = Hope this helps .................... Water Divining - yes it can work, I've used the 'bent coat hanger' divining rods to trace drains [for work - not for fun], but its probably best to talk to a professional rather than a Diviner   Good Luck

If you have an old property talk to the locals, chances are there may already be one. I had three which had been filled with rubble. I dug one out - with my hands as I didn't want to damage the stone walls and as it is above my orto I use it to water the veg in summer.

As we will not be back in Italy until May, cannot help now, however  I am sometimes available in and around Tuscany  as a "water dowser" and come pretty cheaply; lunch and some good vino suffices. I have successfully "dowsed" many wells in California, Hawaii, and Austria, found pipes, leaks, etc. Can "divine" the depth and measure GPM. Must be a moving liquid to detect. No magic involved. due castagne

You should check with the comune about permissions - not always easy to obtain.  

If it is just for be a  water for the garden, what about sinking a large underground cisterna and collecting all rain water from the gutters? Lots of houses near us do this and whilst I suspect it will still need planning permission it maybe a cheaper option than sinking a well. Don't have time to read all the posts but there may be some ideas here: