when you select to build a well then you should see the groundwater grid overlay where you can place your well, you then need to pipe a pump of some form into the well, and a water tower to pump the water to. If when placing a well no water grid overlay appears try turning on debug mode to access the debug options at the top of the screen, when you click the water drop icon the water overlay should be forced to appear, if it doesn't then something went wrong and it got reset, you can then use the tools dropdown to clear or add to the water grid

Thanks Dubwise!! I turned debug mode on and activated it from there.
Just a warning when "Clear gorund water grid" is selected, it's not only disabling the overlay, but the undergound water at all. As I turned it on it automaticaly sterted pumping !!
Thanks again !!

Just another report:
- Fertilizer strength is not saving my changes (after restarting the game)
- I was allowed to research Water Filtration and Sewage Treatment without having Electricity.
And 1 doubt about hot water:
- I see red bars on Hot Water Tanks, looks like they are considered "always full" and it's the temperature, right ?
**Found the electric boilers

ok fixing those things for v1, and the hot water tank will probably be at your capacity all the time unless you turn on the thermostat mode on it, then it will switch off the boilers and drop to 25% before turning back on for 1 hour stints