You don't need to pH your water. I think I speak for 90% here when I advise this. Get kelp meal instead of kelp extract, and simply soak it in water and/or add it direct to your soil mix. It is my understanding that many helpful organic compounds are lost when making te extract vs simply using the real deal - kelp meal. J
You should source some fish hydrosylate instead of emulsions when you can afford to do so. The process used to make emulsion involves high heat application, whereas hydrosylate is made using enzymes (biological decomposition). If you added enough "humus" (EWC/compost) then your soil should have the ability to buffer the PH via the humic acids associated with said materials.
