wouldnt recommend it, you will be locking out valuable nutrients keeping it up at 7. i know its only .5 but will make a difference. Get a cheap aquarium ph down solution and soil testing kit. you may be adding 6.95 water to ph 7 soil or maybe higher
You'll be fine as long as you keep the ph between 6 and 7. The only effective way to change soil ph is to transplant into balanced soil. Balance your water at 6.5ph.