you can also try purchasing Crystal Pro DI filter to change your house tapwater to distilled water,
faster and easier than going to shops and dragging bottles of water home.. haha..
before i bought the DI filter, i was buying distilled water from NTUC.. housebrand..
i think thats the cheapest so far...
during my cycling process, i didnt change water at all for almost a month..
after ammonia and NO2 are undetectable,
i did a 50% water change (at the end of ur cycling process) and thereafter i added in my first LS..
a pair of common clowns