Southern California... the last significant rain was in December, and there probably won't be much until next October or November...
One can often buy RO water from a machine outside a grocery store. Or buy RO or distilled in gallon/4L bottles (OK for a small collection) For an even smaller one, there's a cartridge system called "Zero Water" that is actually a deionizer. (Other"filters" like Britta don't remove minerals)
For the OP, southern California tap water is, to varying degrees, liquid rocks. Fine for Cattleya tribe, Cymbidiums, and most of the rest of the more common orchids. Masdevallias and other Pleurothallids on the other hand, don't do well, at least long term, with that hard water. Those do need pure water. (I had very poor results with the whole group until I got an RO system) Temperature, that Masdevallia will be fine with whatever low temperatures Mother Nature provides... down to occasional frost. The bigger concern for that one is summer highs, and also low humidity. The OP hasn't said what part of southern California they live in, some areas are more conducive to Masdevallias than others. (Right now, humidity where I live is 12%... time to be generous with water drought or no drought.. )
---------- Post added at 08:14 AM ---------- Previous post was at 07:38 AM ----------
Anacheilium chimborazoense, IOSPE has no elevation information, but the name indicates that it grows on the Volcan Chimborazo in Ecuador.. so likely tolerant of the chill of southern California. This is a good time of year to grow a new plant outside - nights are no longer particularly cold, and so it will have a chance to acclimate before next winter.
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