Thanks everyone.
ajax: Thanks. I have seen amphipods, not in person though. After my test I have done today (below) I think even their smallest bottle wouldn't be a solution for me. Plus I can't find them here.
I can appreciate wanting a very small bottle but I wonder how much good it would do to carry so little water?
On some fall/winter runs that are around 10 km (6.2 mi) long I just need a little bit of water or even no water at all. Carrying the bigger fist bottle would be overkill. Plus some trails lead through rugged terrain and I need my hands to be free in case of a fall. I just want a small amount of beverage for comfort that I will drink in half of the route and keep moving.
I have just tried running with Capri-Sonne (Capri Sun in some parts of the world) drink that comes in 200 ml (6.8 US fl oz) pouch. I carried it not in my pocket but in my hand. Carrying the small flexible pouch is very comfortable, I don't almost notice it. You can vary the grip so your fingers are not at the same position all the time which is good for long carry. It's light and small enough. The amount is just right. Unlike the fist bottle I can drop the pouch at a moment's notice (or it wont get in the way like the bottle would) when I am trying to stop my fall.
When I finish it I just fold the pouch and put it in my pocket.
I have also tried to carry it in my pocket but its very uncomfortable and too heavy (uphill or downhill).
I think I have just found the solution for this kind of runs.
Photo from wikipedia:
