ph help

Are there any household items you can use to adjust the ph of your water? ive heard of using 3% hydrogen peroxide for the root rot and other home remedies but so far im in the dark about ph adjustment, im on a very limited budget and want to try something that is free before i spend anymore money ,also that brings up another question ive heard several different answers on what your ph should be but still havent found a good level is there a level that more than just a few ppl can agree upon?

not sure about home remedies but your local grow shop should carry ph-up and down depending on where you live you should only need one or the other they say if you screw up and have to use up and down at the same time you should through it out and start over total cost should be less than 10$ for one bottle and it will last a long long time worth the penny

baking soda will raise your ph levels but from what I read it also increases you alkalinity so not sure if it is what you want to use'
here is the thing you can probably find a home remedy to fix your ph but along with the home remedy comes side effects that you probably won't predict so again I would shell out 10$ for the real deal