Its also possible to use vinegar to adjust the alkalinity of water, but that is for those that understand alkalinity -v- pH and such

If chlorine is an issue, either technical or personal, just let the water sit for a few hours, or overnight, as chlorine degases *very* rapidly out of solution when not in an enclosed container...
If/when deposits might build up in/on soil, just flush pot/soil well every couple weeks (or months) and should not have any issues with 99% of 'bonsai'-type species
Alex