Use wide range pH 1-14 test strips (acid-base) when you have a diverse range of materials, and you are not sure what end of the spectrum you will land on. 

You can test the pH of drinking water, whether straight from the tap or bottled, which should be pH 5-7-6.2. You can also test the pH of urine, which can range from 5.5-7.5 and saliva, which can range from 6.2-6.8.