Final answer:
Items such as soft drink and water bottles, salad dressing bottles, peanut butter and jam jars, and ice cream cone lids are generally single-use and not reserved for customers. Foodborne illness investigations would identify specific food items associated with illness after consumption at the same restaurant.
Step-by-step explanation:
When it comes to items that can be reserved for customers, items such as soft drink, water, and salad dressing bottles; peanut butter and jam jars; and ice cream cone lids are typically not reserved because they are considered single-use once opened or used by a customer. However, if these containers are intact and have not been contaminated or opened, restaurants might reuse them internally, although they wouldn't directly serve from an already used bottle or jar to another customer for health reasons. Small consumer electronics are, of course, non-edible items not associated with food serving.
Regarding potential foodborne illnesses, an investigation would be required to associate a specific food item with the occurrence of disease among the people who ate at a restaurant. If several people who ate at the same place become ill with similar symptoms, and a certain food item was common in their meals, then that item would be suspected as the cause. Items such as egg cartons, packing peanuts, disposable cups, plates, trays, and cutlery, as well as disposable take-away containers, are designed for one-time use and typically are not reserved to ensure health safety standards are met.