This summer when you go see Pirates of the Caribbean: On Stranger Tides  you may see a crescent canteen in use.  Now the one you may see is a movie prop and is made of stainless steel and was purchased from some General Sutler type store.  The original items were tinplate but on the big screen nobody would know the difference but the propmaster.  (By the way I know the propmaster for POTC: Dead Mans Chest and  POTC: At Worlds End but Dave Baumann was not listed on IMDB for POTC: On Stanger Tides.)  There is an excavated example of the canteen at the Fort Ligonier museum in Pennsylvania.  In their display they show one of the canteens in use in a vignette from this painting by Hogarth.  The full image can be found at the Artchive. (this portion lower right hand side)

The literary Encyclopedia descibes the story of the march. The March to Finchley is based on a particular historical moment, probably witnessed by Hogarth himself, but portrayed in the painting from a four-year perspective. It depicts British troops being marched out of London to their place of rendezvous on Finchley Common, about ten miles to the north, in December 1745, to defend the city against the threat of a Jacobite invasion. Charles Edward Stuart (1720-88), the Young Pretender, or ‘Bonnie Prince Charlie', as he came to be known, had landed in Scotland on 23 July 1745 and defeated government forces at the battle

The painting and story take place in England so they are English canteens.  These canteens were also imported from England for use by soldiers in the Americas.  American made canteens were different from the crescent and kidney as they had a larger bottom than top for more capacity.  This is the American canteen I make based on two surviving examples. One is from Newburgh, New York, is part of Washington's Headquarters Museum Collection and belonged to Abraham Von Vlack Jr. 2nd regiment Dutchess County Militia. The other is from the private Craig Nannos collection.