Thanks for the reply Borek,
Which substances I want to use:
Sodium Bicarbonate, NaHCO3
Potassium Bicarbonate, KHCO3
Magnesium Sulfate, MgSO4 + 7H2O (just learned that epsom salt is heptahydrate)
Distilled Water, H2O
Not a single reaction equation... I'm not sure which reactions might occur...