Chemical formulas for photographic processing and printing, frequently recommend the use of distilled water, whilst deionised and purified water are considered acceptable substitutes. I have found that both distilled and purified water are nigh on impossible to obtain. Whereas deionised water is readily available as car battery top up water.
What I would like to know is, what advantages and/or disadvantages are there, if any, of using one of these types of water over another?
(I don't need to know the difference between each of the three types of water.)