Water Kefir

My water kefir grains arrived in the mail from the kefirlady, yesterday, Yay! And following the directions, I got them into sugar water as quickly as I could. Now the quandry... spring water, filtered tap water, boiled tap water, boiled filtered tap water, boiled tap water plus minerals...
Almost everything I've read says hard water = good, okay I'll use tap water, chlorine = bad, so I use filtered tap water. But if my filter removes chlorine - which I sure hope it does - is the water then too soft? Some people report their water kefir thrives on their city water, without any changes required, cool maybe I can use filtered tap water. Bah! this living healthy thing is giving me a migraine.
Chlorine can be removed by boiling 15 minutes OR run in a blender for 15 minutes. If I run my blender for 15 minutes, I will likely be deaf and have a burnt out blender. If I boil water for 15 minutes, I'm not sure there'd be any water left.
I ended up splitting the grains in half just to see which kind of water worked better. So two tablespoons of grains went in bottled spring water plus 1/6 cup sugar 1/2 tablespoon organic sucanat. The rest of the grains went in cooled boiled filtered tap water with the same sugar and grain combo. 20ish hours later there's a significant difference between the grains.
The spring water grains are round and fluffy looking with more floaty type activity going on. The grains in the left jar just look sad. So I dumped the grains into my nylony coffee filter and since I'm out of bottled water, put plain ole tap water in with more sugar. I'm afraid the chlorine and possible floride in the water may not be good for the grains, but hopefully it isn't worse than the boiled filtered water I tried first.
I think kefir lady's directions said we can put minerals etc back into filtered water... that sounds a little more economic than buying bottled water for the rest of my grains' lives.