You could but I wouldn't. The water will still have significant amounts of phosphates and nitrates that could cause algae outbreaks. Chlorine and chloramine would be huge concerns. You'd need to use Prime to remove chlorine before using it in your tank.
People can and do use tap water for their reefs and often get away with it. If you are heading in the direction of being a reef junkie and are considering the more challenging types of livestock that are more sensitive to what's in the water... the investment in a $150 RO/DI will be worth 20 times that to keep your $3000 investment in corals and fish in top health (ie. not dead).
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