Back in the day, water skins (rawhide water containers) were only meant to hold water for a day or less. Wine keeps longer but not much. Maybe a few days.
If you apply rosin to the inside of the skin, the skin will not absorb the liquid as fast, so the contents will stay fresher longer.
Skins were made from stomachs and other natural "bladders". Even large fish bladders were used. The openings were tied shut with moist rawhide or sinew. Straps were made from gut or whatever cordage was available.
The best resources for information about water skins is from areas around the world were rawide containers are still used. These areas are usually very poor, undeveloped, and rural. Sometimes you can find info in documetaries. It has taken me years to gather what little info I have.
The preferred method of water storage was in gourds, pottery, or wood containers (bamboo or cane).