OpenStreetMap - Drinking Water

Primary map features representing drinkable water sources are mainly amenity=drinking_water, man_made=water_tap or natural=spring.

The most important additional property is drinking_water=yes.

All tags related to (drinking) water:

amenity=drinking_water
amenity=water_point
man_made=water_tap
man_made=drinking_fountain
natural=spring

drinking_water=yes
drinking_water:refill=yes
drinkable=yes
drink=*
fountain=drinking

man_made=water_well
man_made=spring_box

amenity=fountain
watering_place

For definitions of those tags see below.

Definitions from the OpenStreetMap Wiki

Drinkable

Primary Features

amenity=drinking_water
A drinking water source which provides potable water for consumption (link)
amenity=water_point
Places where you can get larger amounts of "drinking water" for filling a fresh water holding tank, such as found on caravans, RVs and boats (link)
man_made=water_tap
Publicly usable water tap (link)
man_made=drinking_fountain
Provides a small jet of drinking water (link)
Usage discouraged. amenity=drinking_water should be used instead.
natural=spring
A place where ground water flows naturally from the ground (link)

Additional Properties

dinking_water=yes
Indication whether a feature provides drinking water (link)
Additional tags: drinking_water:refill=yes
drinkable=yes
Usage discouraged. drinking_water=yes should be used instead.
drink=*
Describes if (and optionally how) a certain drink is available at an amenity or shop (link)
fountain=drinking
Subtype for a generic drinking water fountain (link)

Maybe drinkable

man_made=water_well (Primary feature)
A structural facility to access ground water, created by digging or drilling (link)
man_made=spring_box (Additional property)
A structure designed for protecting and catching groundwater from a natural spring (link)
Usually in combination with natural=spring

Probably not drinkable

amenity=fountain (Primary feature)
A fountain with cultural, decorative, or historical significance or which serves a recreational purpose (link)
Additional property could be fountain=drinking
watering_place (Primary feature)
A place where water is contained and animals such as horses can drink (link)

Overpass Turbo Query

Note: This query is not up-to-date with above list

Overpass Turbo Query:

[out:json];
(
  node[amenity=drinking_water]({{bbox}});
  node[waterway=water_point]({{bbox}});
  node[amenity=water_point]({{bbox}});
  node[amenity=drinking_water]({{bbox}});
  node[amenity=fountain]({{bbox}});
  node[man_made=water_well]({{bbox}});
  node[man_made=water_tap]({{bbox}});
  node[natural=spring]({{bbox}});
  node[drinking_water=yes]({{bbox}});
  node[drinkable=yes]({{bbox}});
);
out body;

Resources