For example, the "Platinum Premium ($29.99/mo)" water would be cold, filtered, and free of pathogens, the "Plus Preferred ($14.99/mo)" would be room temperature tap water, and "Tap Basics ($4.99)" would include a small dose of giardia.
You could pay local independent contractors a small fee to restock your kiosks with the protozoans, so then you wouldn't have to carry the labour overhead.