And I am pretty sure I asked this a little while ago but I want to make sure...live plants would be ok as well, right? None are high maintenence, all low light (cyps, java fern, val, ect...)
The acclimation to the new water can be done in a few hours without a hitch. So doing it as 10-20% every couple of days would be even safer than that. In other words, you are not facing any challenges, problems or even worthwhile concerns. Just do it.
I don't understand the rush with daily water changes. Why not just use tap water in your regular weekly changes. That would give them weeks to acclimatize.