I have come up with a DIY constant water supply with a pressure sprayer / pipe and a 1ml syringe with the finger end cut off and a blunt needle. The flow of the water is controlled by the position of the elastic band,I just roll it further down putting more pressure on the trigger. I will either fix it to the tile to be cut and aim at the blade or attach to the grinder and point at the blade from there making sure that it is very secure of course. I can use an even finer needle for a thinner and longer water jet so I can keep it well away from the blade