Here is a water well right next to the Sörmlandsleden trail. It is larger compared to most other water wells, constructed from a wide concrete cylinder with a wooden top that has a lid in it. The water level is quite low, so it is not really possible to reach down to the water. You have to lower something down to fetch the water with. The water quality when I visited didn't seem great, but is probably fine to drink if filtered, boiled or otherwise treated first.