i would say it depends on the water quality of your area. in abbotsford the water is only 11 tds which is extremly low for tap water. but even so i use an rp/di just because i like the peace of mind haha. if the quality of water in your area is good then you can probably get away with treating it. but if your not mixing up to much water you can look into those tap water purifiers that just run the tap water through a cylinder with a de-ionization filterinside. those work fairly well and are a cheaper alternative to the full ro di.
hope this helps and if im way of someone will correct me im sure haha
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