One of the beauties of the Platypus system is that the fitting works very well with caps from many water and soda bottles, such as Coke or Pepsi. If the water bottle cap fits a Coke, etc., bottle without leaking, you should be all set. Most Poland Springs bottles seem to have caps that are just a little smaller than Platys and soda bottles, so their bottles probably will not work with a screw-on Platypus connector.

CamperMom