Yeah mang, unless your tapwater is just rancid, i'd just keep it simple and use that. Let it sit out and evap the chlorine and you're good to go.

Not too familiar with Tiger Bloom or FF, but as long as you dont over fert too early in their growth, you should be good. To keep it safe, medium strength directions. I'd also recommend adding a little B1 to your water early on to promote stable roots...

good luck!