Home Bar - Marry Two Bottles of Different Brands? In my home bar, I have some tequila, rum, vodka, and bourbon. Each of these types now has two or more brands (the extras were gifts), which take up space.
I'd like to keep my home bar simple and just have one bottle of each type.

What issues are there with doing this?
Is this safe?
How will this affect the cocktails I might make?
How should I calculate the new alcohol level?
If the bottles are standard everyday bargain brands then I don't see much problem with mixing them together by type. However it would seem a shame to take a premium bourbon and mix it with something cheap. As for your other question, I'd guess it is as safe as having separate bottles. Unless the cocktail recipe specifies a specific brand I doubt it will affect the result much. As far as alcohol content, most gins (for example) are going to be similar in ABV so mixing won't change things much. Calculating the ABV of the result is a weighted average. Take the ABV of bottle A times the volume in bottle A add the ABV of bottle B times the volume in bottle B and divide the result by the final volume.