10 Serve the meal on time (if a meal was indicated) if your hosting through meal time you must serve a meal
11 Provide a variety, some dishes should be meat free, some cheese free ,some vegetable free and some wheat free(serving just one casserole is allowed but should be announced). There should be a choice of non alcoholic beverages. Diet and regular soda's, milk, water , coffee/tea , water and one or two juices.
12 Do not use any ingredient in everything. Just because you can incorporate spinach into every component of every course doesn't mean you should.
Edited to clarify
Apologies I was rushed and didn't phrase that well ....
I was thinking this ......... coffee or tea , water then one sweet drink (soda or juice or iced tea) and one not sweet/low sugar drink (diet soda or milk or iced tea) but if I used iced tea as the sweet and not sweet I'd add one non-caffeinated choice.
So for an 8 person party I'd end up with coffee , juice, water ,add your own sugar/sweeter iced tea.
Or I'd have coffee, water , regular/diet soda and juice , but I'd only buy 1or 2 liters of the diet and 1 liter of the juice based on past experience and 24 ish servings of the regular soda if it was a dry party. I'd wouldn't have 16-24 servings of each.