something given without charge or cost, as a ticket to a performance or sports event or a free sample at a store

Link to present incidents:
Moscow: Refreshing freebies to keep metro users cool. Staying cool in the heat of an urban summer can be tricky, but Moscow's metro users can now freshen up with free water and wet wipes. Officials say that on hot days they'll be handing out more than 300,000 bottles of water and 200,000 cooling hand wipes to help the capital's commuters stay comfortable.