go for the least-expensive bottle available. You're only wasting money if you shell out for the top-shelf stuff. Remember that you're going to layer in your own flavor, so you don't want strong notes of floral, citrus, or whatever else the heck people claim straight vodka tastes like. The only thing to be mindful of is what the vodka is distilled from. It can be made with ingredients as varied as grains, potatoes, and even grapes. If you're gluten-free, be sure that your vodka was not distilled from grains like wheat or barley.
I always seem to have an abundance of quart and half-gallon wide mouth mason jars on hand. In addition to looking nice, they're ideal for infusing alcohol. They won't impart "off" flavors to the booze the way plastic would, and the wide mouth is big enough to accommodate whatever you're going to infuse with. (An apple does not fit very neatly through the neck of a vodka bottle.)
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