New Grower substitute ph calibration fluid?

[Musturd]

Hi Folks, I am out of calibration fluid and forgot to get some while I could and tonite I really want to get an idea of where this soil I have been cooking for awhile is at.

I have 3 gallons of new distilled water. Everytime I have checked this brand distilled water it has been 7.0 to7.1. Im going to use a couple different jugs and calibrate to 7. Does any one know of a substitute calibration fluid?

And while Im on it I have only calibrated to 7 not the 4 or 10 is this ok? Its the less expensive Hanna 9810 maybe.

Thanks