If we ran out of a product or ingredient, how would you tell the customer?

I won’t be adjusting with the quality of the product, I will let them know that the particular drink or ingredients are not available right now and we won’t be able to make the same thing that they have ordered. But I would like to tell them the list of other alternatives that they can order with briefing their importance one by one until the customer finds another product they would like to buy.