CALIBRATION KIT 4.0ph, 7.0ph, 10.0ph
 

I just bought Checker PH tester by Hanna Instruments and have a question
about calibration kit. It says in the manual that I have to empty powder in
100ml of water but I heard that you can split capsules up to 15 times.
That's what I read "May enough buffer for about 15 calibrations if you are
not wasteful." Also what water should I use? Can I use 1gal. Jewel or
Dominicks drinking water?