What is Reddit's opinion of Basnge PH Meter,Digital PH Tester Pen 0.01 High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking Water,Pool and Aquarium?

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You could pick up a pH test kit (strips) to get an idea what the pH is at. I use a cheap electronic one for my other hobby and it works really well.

You will probably need to take a spoonful and add some water in a cup to get enough liquid for the meter to read.

The electronic one works really well when I’m preparing my nutrients. I use a liquid pH up and pH down chemical to dial in a pH of 6.5

https://www.amazon.com/Backlight-Precision-Suitable-Drinking-Swimming/dp/B083XH85DC

Catching rain water and using it is best for bonsai. Just depends on your tap water. I suggest getting a ph pen tester. Anything below 6.8-7 ph is fine for bonsai. I use this one

I found this

Digital PH Meter,Backlight PH Meter 0.01 High Precision Water Quality Tester, PH Range is 0-14, Suitable for Drinking Water Swimming Pool and Aquarium PH Tester Design, with ATC https://www.amazon.com/dp/B083XH85DC/ref=cm_sw_r_cp_api_glt_fabc_ZV98EXCMT6R2GRRPMNAF?_encoding=UTF8&psc=1

50/50 is the standard minimum. Refrigerate and/or eat quickly.

You could also add some extra "insurance" with a cheap ph meter to check against the standard 4.6 ph: https://www.amazon.com/Backlight-Precision-Suitable-Drinking-Swimming/dp/B083XH85DC/ref=sr_1_3?crid=N4TT85PIJRBN&dchild=1&keywords=ph+tester+digital&qid=1627051114&sprefix=ph+tester%2Caps%2C183&sr=8-3

As for me, it's now fridge pickles or nothing. My first year I made something like 60L of water bath canned pickles. Trimmed the blossom ends, used pickle crisp, but 2-3 years later the pickles were still fine but inedible to me because of the texture.