I just use lemon concentrate at home. Many people here will balk at it, but some of the brands you can buy here are alright and IMO it's fine for home use if you're just using it for a twist and not something like a Daiquiri.

Atomizer of extract is exactly what I use. Don't try it with just the oil; it'll clog up your atomizer. Find an extract that only has oil and alcohol as the ingredients. It's 80% as good as a citrus twist for 1% of the work.

For something like a quick and dirty Old Fashioned I just add a dash or two of orange bitters