its not the ph of the water killing your plants. its the additives and the residual nutrients that residue is what overtime chanages the ph of your soil. its not the ph of your water. if you have water like that use different water.
phing water in soil grows is a marijuana internet phenomenon and is backed by the hydro stores so you buy their shit.
ph of water instantly adapts or "buffers" to the ph of the soil. this is science.. Ph is important but its the ph of the soil that matters. and you cant change the ph of soil by changing the ph of water.
If you want to fix your ph problems buy a soil with good ph to start with or do something that will actually change the ph like this :
http://www.ipm.iastate.edu/ipm/hortnews/1994/4-6-1994/ph.html
notice this quote :
"Modifying a soil's pH is usually a slow process and may require repeat treatments. It is often most effective to use a combination of treatments. However, don't expect a quick fix or a miracle cure."
only places you find telling you to ph your water is marijuana growing forums.
the only real reason to ph your water would be for a hydro grow or if your water is so fucked up that it wouldnt even be drinkable..bc the water will still hit the roots for a moment before it buffers.
and heres a study of the effect of ph water on soil.
http://www.tamu-commerce.edu/agscience/res-dlc/blueberr/blue.html
Use of lake water with a pH of 7.10 had no effect on soil pH during the first year of the experiment (Table 2). Well water with a pH of 8.70 caused soil pH to increase to 5.56, while acidified well water reduced soil pH to 5.32 by the end of the first year. those differences are pathetic and took a year..how long to your plants live for?
read this inform yourself and naysayers fuckoff.