In one system, water is apportioned according to ability and willingness to spend, and the supply goes up as sellers arrive to take advantage of high prices. People also don't waste water they don't need (e.g. for washing) even if they have the money; they sell it.
In the other system, water is apportioned according to who can get to the store faster, and supply never goes up because nobody has a reason to restore it. People use drinking water for washing if they have it, because it's not like you can sell it anyway.
In both scenarios the is significant inequity (whether by money or ability to get to a store fast and fight/negotiate for water). But overall, many more people suffer in scenario 2. This is obvious given all the suboptimal water use in scenario 2.
It's hard for me to understand why you'd prefer a scenario where obviously more people suffer.