HeyHans,
I managed to get most of my water bottles together to take a few photos, I do not have anything is as nice condition as yours or Adler's', but I do have a few.
First are my German Feldflaschen
an aluminum Flasch with the cup attached to an early war breadbag
a steel Feldflasch with the steel cup attached to a later bread bag
On the right is a M1907 Feldflasch with out a cover, and on the left is an unidentifyed bottle with a cup attached, it looks to be German construction, and I have found similar ones in the German Alfa catalogue, but this is still unknown.
a selection of Austrian Feldflaschem, the first on the left is the standard war time production, dated 1916 with matching nesting cup, in the center right is the pre-war aluminum waterbottle, dated 914 (1914) and on the right is a steel wartime model with leather carrying strap common to the mounted soldiers, this one belonged to the grand father oaf a friend, and he was with the Tirolean Mounted Kaisresschützen. All these were 1/2 liter capacity.
My two French Biddon, the early 1 liter modle and the 1877 2 liter modle, French soldiers would often carry two of the two liter canteens, I think the French were the only ones who realized that soldiers needed water to do their job.
since Hans got off topic and posted the French Biddons, I thought I would add a few more, here is a stink common US canteen, cup and cover. The only thing of note here is that the cover is marked to the 110 infantry, company A. The was the unit my grandfather served with, and I had a bit of trouble being able to afford a marked bit of equipment, as many 101st Airborn collectors think this fits in their collection.
on the left is a Portuguese water bottle with the Mills carrier, on the right is a Belgian water bottle
on the left is a Russian water bottle, dated 1910, the center is unidentifyed, it follows the construction pattern of the Russian wodden water bottle, but the Italians alsoproduced a wooden water bottle like this, the standard Italian wooden water bottle is made from staves rather than a solit bit of wood. On the right is the Italian M1917 water bottle.
I should have a few additions in the future.
Best wishes
Gsu