Buongiorno,
The first thing I would do is ask the people who run your accommodations, many times they have an account somewhere (that they use) and can put you in contact with someone.
However, a quick research lead me to this page, which is a list of drink wholesales in the Lucca area, there some with website - and email addresses just reach out to a few and see how they respond:
http://www.beverfood.com/grossisti/lu-lucca
Buon Viaggio,
Donna Denise
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