The type of filters your talking about really don't remove all that much from the water. They DO help with taste and some heavy metals but IMO you'll still need the conditioner so just use that and save the filter for drinking water... Better yet get a nice RO/DI system and have totally pure water.....
although we have a large under sink filter we just hook up our python to the faucett,adjust the temp and fill the tanks while im dosing the water conditioners.works for me...allwet.....