Although the 5-gallon bottle is the usual size depending upon the usage from light to heavy, they do come in other sizes. The 3 gallon for lighter use and up to 7.5 gallons for more heavier use.
Dispensers are manufactured in companies, such as Brentoma, Aquaid and Wizcom. Water dispensers come in different sizes and with or without cooling systems.
There are Active and Passive type Chilled Beams and they come in many different sizes. I recently priced, March 2011, 50ea. 2x4 foot, active chilled beams from my local Price rep for $22,500. That's $450 per active chilled beam.
Not all refrigerators with ice and water dispensers come standard with water filtration. You will need to check its specifications before purchase if you require this feature.
There are sets available that include both the calculator and the tape dispensers but not an all in one unit.
So that the internals of the cooler don't get gunked up by precipitates that come out of suspension when the water is chilled. Solubles will still precipitate out.
Bike water bottles typically come in two sizes: 20 ounces and 24 ounces.
Cycling water bottles typically come in three sizes: 16 oz, 20 oz, and 24 oz.
That will depend on the size of the kettle. They come in different sizes.
Watering cans come in many different sizes.
A typical glass of water holds 8 ounces, although glasses do come in various sizes.
A "Pitcher" is a container for liquids, usually having a handle and a lip or spout for pouring (in other words a Jug). They do not come in definite sizes. Thus " the capacity of a pitcher of water" is the amount of water the Jug will hold.
You can purchase a water cooler dispenser on Amazon and eBay. These two online stores sell hundreds of water cooler dispensers in their inventory. Most of these dispensers come with free shipping on Amazon.