I was excited by your post too. I'm not sure about a pond or reservoir with herbs growing around. I guess you would have to experiment with it.
I know fired clay is supposed to have a beneficial effect on water. Very elemental!
It is interesting that so many of us are having visions of healing water, and that the water can form the centre point of a community. I know I read something last week about the southern US, and how it was tradition to offer anyone visiting the home a glass of water because of hospitality/heat/climate. I know in India it is standard to be offered a glass of water from a sitting reservoir (not the tap). A lot of this is these days replaced by juice, cola etc. We're missing our water!