Preserving a Cucumber Toner - How?

[Guest guest]

Apologizing now for this being cross posted. I personally use a toner

that uses cucumber juice and I absolutely love it. After talking

about it with a customer, she wants to buy some. I make it in small

doses for myself because of the fresh juice. It's basically a

combination of cucumber juice, witch hazel, distilled water, and

alcohol (vodka - which is actually optional). Is there anything I can

add to be able to sell this?

Also, stuff with honey, or oatmeal that's been moistened in

something, are there preservatives that can be added to these as

well?