I agree.For dropping pH I find lemon juice to be perfect. Natural product, apart from a tiny amount of potassium sulphate, and easy to slowly add to your water to bring the pH to exactly what you want. And it's cheap as hell too.
I don't worry about pH "up" because our tap water is kinda in the middle between "soft" and "hard" so there's that nice bit of calcium in it but I always have baking soda in the house anyway if necessary.
Why spend money on chemicals when there's perfectly good stuff you use for cooking that does the same?
Except here lemons are about a dollar each. Sometimes two or three.
Believe it or not it's cheaper where I am to buy citric acid, than it is to buy lemons.