MIMedGrower
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In soil there is always biological activity producing minerals for the plants. In coco the only minerals available are introduced. I wouldn't recommend water only but slowly diluting and changing the percentages over the remaining days/weeks of flower. The last day or two should be okay but the plant will need nutes, just in different percentages and levels than when vegging.
I deplete the 3 gallon pots of most nutrients by week 3 on average. So if i quit feeding (lightly each watering is my style) the plants will yellow right away. So i taper like you just said even in potting soil.