It is important that you have a good filtration system if you are using micro-drip to avoid plugging the emitters. We have municipal water but it is getting expensive as the city tries to balance the budget by rate increases. Our roof run off in collected and drains over the hill and I have considered purchasing a large water tank to catch that water and pumping out of it for the garden and I have even thought of hand digging a well...
You are thinking too much! LOL