True distilled water with little to no PPMs has no pH to adjust. It will be neutral and your meter wont give you a true reading. So just use distilled or reverse osmosis water as is.
Sometimes a little water on the leaves will cause a few spots. The soil is a mix of Coco Coir and Ocean Forest soil.
It is possible to cause a little spotting, but it will come out of it fine. I think you look good so far.