I will prove to you that God exists

[Sheldon]

The hole comes first, then the water fills it exactly, this does not suggest that the hole was designed or created for the water, but rather that the water has properties that the hold allows to make it fit. You are putting your wheezy clapped out old pony behind your cart. this is common error in reasoning among creationists.

Any hole any size, any shape right? 

Yes, the water has the necessary properties so it doesn't matter, obviously. In this analogy the universe we currently observe has the necessary properties that enable organic life to emerge, and once it emerged it has evolved to survive in, or rather on, at least one planet in that universe. No fine tuning needed or evidenced, and no deity demonstrated as even possible. 

Where does the fine tuning come in? 

It doesn't, that's rather the point. It's an unevidenced assumption creationist use, in their fallacious arguments, to try and justify their belief in an unevidenced deity, using inexplicable magic. How this is more plausible than as yet unknown natural phenomena is never forthcoming obviously, since we know the latter are possible, unlike the unevidenced deity of course. A point you seem a little too keen to ignore.