The Water-Witch™ requires an undamaged, semi-rigid bottle that will not collapse when it is turned upside down, and with a screw thread that matches. Nearly all soda/pop/carbonated plastic soft drink bottles sold in the Americas, Asia and Africa (including sparkling waters) are suitable. For indoor use we recommend 8 – 42 oz bottles (250, 330, 500, 1000 or 1250 mL). For outdoor use 32 – 64 oz (1000, 1250 or 2000 mL) bottles work well. If in doubt whether a bottle will fit the Water-Witch™, compare the cap of your bottle to that of a Coca-Cola or Pepsi bottle, which are known to fit.

Still ("natural" or "spring") waters have a different thread. In addition, some supermarket brands of 2000 mL bottles use a thin and soft plastic that it too soft for this application (smaller sizes are fine). If you have used bottles available and are in doubt, simply try one! If the cap screws on and seals properly and the bottle does not collapse when inverted, the Water-Witch™ will work.

Verified brands of carbonated plastic soft drink bottles (8-64 oz, 250-2000mL) that function well with the Water-Witch™ include:

• Coca-Cola® (all variants)

• Fanta® (all variants)

• Pepsi® (all variants)

• Seven Up®

• Sprite®

• Dr. Pepper®

• Mountain Dew®

• Evian® Sparkling Water

• Perrier® Sparkling Water