In some cases, there are already wells where run-off water is used to irrigate street trees, for example. However, there are only "a handful", as it was said. They are located on Fischerinsel, in Mauerpark and in Spandau on the Schifffahrtsufer. There is often a lack of space and the additional underground construction work has to be carried out by the respective district authorities. In addition to public drinking water dispensers, there are initiatives such as Refill: stores with a Refill sticker, including supermarkets, pharmacies and bookshops, fill tap water into bottles brought in free of charge.