What water for steaming baby first foods?

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We are starting my 5 an a half month old on solid food. Today was the fort time I gave her something cooked (steamed). For Christmas my mil gave me a baby food maker. It steams the food then purées it. After useing it the first time, it occurred to me that I didn't know what water Was ok to use. I absent mindedly used tap water that we drink daily. We are in alaska so the water is very clean but is there a better option?

Is there special baby water to use? Bottled water? Pre boiled water?? HELPPP