Question about water Perimeters, Help!?

ok. first i suggest you get a gallon jug, fill 1/3 with your tap water another 1/3 with distilled, and the rest with spring water. this jug will always be used when you do your 25% water change every 4 weeks. the ammonia should always be zero, as well as the nitrate and nitrite, the ph should 7.0 neutral. get the test strips they are easy and have accurate readings. also clean the filter with every water change