Can you tell the difference between vodka with water and without?

It's impossible to tell the difference between vodka with water and without just by tasting it. Here's why:

* Vodka is already diluted: Vodka is typically 40% alcohol by volume (ABV), meaning it's already a mixture of ethanol and water.

* Tasteless and odorless: Vodka is designed to be neutral in flavor and aroma. Adding a small amount of water won't significantly alter its taste profile.

* Dilution changes the proof: Adding water does dilute the vodka, lowering the ABV, but the difference in proof will be subtle and probably not noticeable to most palates.

What *might* be a noticeable difference:

* Texture: You might feel a slightly smoother, softer mouthfeel with water added, but this is very subjective.

* Chill factor: Adding water can slightly reduce the chill of vodka, especially when served straight or on the rocks.

In conclusion: You can't really taste the difference between vodka with water and without. The addition of water might offer a slightly smoother feel, but the taste will remain essentially unchanged.