Answers

Do I need to provide the alcohol for a mobile bar service?

In California, yes, in almost every case the host buys the alcohol. Mobile bartending services that do not hold a liquor licence are legally not allowed to sell or resell alcohol, so they provide the bartenders, the bar, and the mixers, and you provide the bottles.

Why the law works this way

Selling alcohol in California requires a licence from the Department of Alcoholic Beverage Control. Most mobile bartending companies are staffing and service businesses rather than licensed retailers, so they operate on what the industry calls a dry hire model: you own the alcohol, they pour it. Nothing is being sold to your guests, which keeps a private event squarely inside the rules.

This is not a loophole or a shortcut. It is the standard structure for private event bartending across the state, and it is why nearly every quote you receive will exclude the cost of the product itself.

What that means practically

You buy and own everything alcoholic. Your bartending service typically brings the rest: the bar itself, ice, coolers, mixers, juices, syrups, garnishes, tools, and the trained staff. Where the line falls depends on the package, so confirm it in writing. At the entry level, some services bring only the bartender and their tools, and mixers become your responsibility too.

The practical upside is control. You choose the producers, which matters a great deal in Sonoma County where you may want a specific neighbour vineyard on the list. You buy at retail rather than paying a markup. And whatever is unopened at the end of the night goes home with you.

How much to buy

The rough planning figure most bartenders use is one drink per guest per hour for the first hour and slightly less for each hour after. For a four hour reception with 100 guests, that means budgeting around 350 drinks total. Translated into bottles, a standard 750ml spirit bottle yields roughly 16 cocktails, a bottle of wine gives five glasses, and a case of beer is 24 servings.

A common and reliable split for a wedding is roughly half wine, thirty percent beer or seltzer, and twenty percent spirits, adjusted for what you know about your guests. If you are running two signature cocktails, most of the spirit volume will go into those rather than into free pours.

We provide a per-event shopping list with exact quantities once we know your headcount and menu, which is generally the difference between one trip to the store and three.

Where to buy it

For volume, warehouse clubs and larger retailers are hard to beat, and several will let you return unopened cases. For anything local and interesting, Sonoma and Marin are full of producers who will sell direct and often discount by the case. Ask about case pricing even if it is not advertised, and ask whether they will hold the order for pickup the week of your event so you are not storing it for a month.

One warning: buy earlier than feels necessary. Chasing a specific bottle three days before a wedding is a bad use of that week.

Are there exceptions?

Yes, a few. A venue with its own liquor licence may require that all alcohol be purchased through them, which overrides everything above, so check your venue contract before you buy a single bottle. Some caterers hold licences and can sell alcohol as part of a package. And certain events can be covered by an ABC catering authorisation or daily licence, but those are generally obtained by an already-licensed business rather than by a host.

Because these rules change and enforcement varies by county, confirm the specifics with your venue and, where relevant, with California ABC directly.

What you should still expect from the service

Providing your own alcohol does not mean taking on the risk. A professional mobile bar should still bring RBS-certified bartenders, carry general liability insurance, refuse service to anyone visibly intoxicated or unable to show valid identification, and cut off the bar at the time you agreed. That judgment is most of what you are actually paying for.

If a service is willing to skip any of that, the savings are not worth it.