The phrase "cocktail for" is correct and usable in written English.
You can use this phrase to indicate that someone is about to receive a cocktail. For example, "I'll make a cocktail for you to enjoy."
"That's a perfect cocktail for negativity".
It's a cocktail for slow, contemplative sipping.
I'll swap my prawn cocktail for Spurlock's burger any day.
"This is a wonderful cocktail for global public attention: oil, diamonds, civil war and land mines.
Blending art and technology makes a particularly potent cocktail for rubes.
Both documentaries are sardonic, informative and fun: the perfect cocktail for self-hating celebrity watchers.
In India he sells the same cocktail for about $1,100 a year.
[Occupy Wall St.] A West Village bartender created a cocktail for the 99 percent.
Mr. Thrasher created the cocktail for his business partner, who had just quit smoking.
— Emily Weinstein Esquire: Behold the Autumn Leaves, which sounds like a fine cocktail for the season.
– Glenn Collins Esquire: A cocktail for a big man in a long leather coat.
