Wow!
Here in the big box pet stores they sell liters.....
nope just looked it up (was looking for the price).
32oz. / 947ml of bottled pre conditioned Betta water for $4.79, so that's a bargain! I think a gallon of spring water is appx. a dollar (just under 4 liters) at the grocery store.
Never looked at the price of it! No wonder people don't want to change their Betta's water very often.