By popular request we have made up ready to use completely organic Mexican Pinguicula mix. This premium substrate will allow your plants to thrive by providing them the proper substrate to live on.  The ingredients are simple yet very effective for these types of plants. Made with premium products consisting of:
(By volume)
2 x large chunk pumice 
1 x small chunk pumice
1 x  small perlite
1 x fine lava rock (almost dust, like sand)
1.5 x organic peat moss (sunshine organic peat)
1 pound of dry substrate is the equivalent of five-3 inch pots