which water use?

I tested the water of the shower/bath:
9 KH
7 PH
<0,01 mg/l NO2
but: 30 mg/l for NO3 :/

And also our rainwater:
2KH
6,5-7 PH
0,2 mg/l for NO2 😦
but: 1 mg/l NO3


Now my question is: which kind of water should I use? 
I have blue fairy, bumblebee and cherry shrimps in one tank and one betta in another tank….

Hum I guess Ill go for the one with less NO2.

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