Oi. xD
one of the main sticky threads is actually about cycling
you can check it out at:
https://www.fishforums.net/threads/cycle-your-tank-a-complete-guide-for-beginners.475055/
with regards to water changes and testing etc...
you can also get filter media from an established tank to help your cycle go a bit faster
as for the softener/filter whatever you have
is it a powered magnetic softener on the main pipe? or an ro water system?
is it a house with multiple tanks? or a condo with a central building system?
as some people in Toronto tend to go a little overboard with the whole hard water thing
I'd find out first what you have in your tap water...is it an RO system like those from home depot filling up the tanks for general usage
because if you have an RO system and can bypass it...you could mix percentages of the water to attain the hardness you want
do keep in mind you can over time adjust soft-water fish to harder water but not the other way around
as soft/hard water fish just means their mineral intake at any given time and harder ones can't really thrown in soft and expected to do well
and one of the reasons your fish just died...
myself I use an amazon tap filter which filters most of the chlorine and some minerals and I have a ph controller to keep it around 7
as for tap water stats I'll drop a screenshot of Toronto tap for your reference.
these values are from water plants and NOT what you get on your tap specially not in toronto with all the old piping
whatever values shown from Toronto Water tend to be higher than their Average water test results...hence all the filters/kettles/boilers etc...
as for getting fish...there's lots of people selling stuff on kijiji which can be a ton cheaper than buying in stores
if you need cycled filter media I can give you some