They are becoming easier to
find, because these bottles are what you have to
put liquids in when
you fly on an airplane.
If you can’t find one anywhere, then you can just use any plastic bottle with a spout that squirts, like a Rubbermaid picnic bottle or a kitchen squeeze bottle.
The best, once again, is a small travel squeeze bottle, which is listed as a 4 oz. bottle, but actually holds about 5 oz. or about 140 milliliters. Fill it up from the gallon of saline solution.