lingling, MLT has quoted an excellent source and I agree with what she has written. I will only add a little detail. 'Food and Drink' fits under the definition of a collocation. Just as 'Bread and Water' is the Western expression for the most basic nourishment, 'Food and Drink' represents the entire category of solid and liquid nourishment (including alcoholic drinks) as MLT stated. 'Food and drinks' is not a collocation; it means exactly what it says. Food and a number of portions of drinkable liquid. If you bring food and drinkS to the party, along with something to eat you are bringing cans of beer, bottles of soda, bottles of water, etc.(or maybe a big keg of beer and many cups.) You are bringing portions,or something that can be made into portions or drinks, which most likely will be shared with the other guests. However, there is a custom in middle class America called BYOB (bring your own booze) where everyone brings their own alcoholic beverages so that the host is not left with a huge bill. The same applies at a restaurant. You don't pay for 'food and drink' you pay for 'food and drinkS'. Each drink is paid for separately and many drinks can add up to a lot of cash. That is how many restaurants make their money!

1. The phrase "food and drink" is less specific and is perhaps a way to categorize something. Example: "That book belongs in the Food and Drink category." or "Let's discuss food and drink in Spain." 2. The "phrase food and drinks" is more specific and tangible. (and maybe more common) Example: "They will bring food and drinks to the party." or "They will bring the food and drinks to the party." or "Free food and drinks are offered at the hotel restaurant." Of course, this is only opinion and from my personal point of view. Truthfully, the difference is slight. Source: myself, American English

Thanks, Denis, for elaborating on my answer. You gave some interesting details! Just one clarification, not all Americans (and certainly not a majority, in my opinion) practice the "custom" of BYOB..... or perhaps it is where I live. I would hate to deceive lingling with this generalization by calling it a "custom." :)