Mine turned purple, which is apparently dehydrated which I have no idea why I would be with 2ltrs down me, so apparently that is ketosis aswell (the purple i mean) x
Yes the purple is ketosis as well. How long was it between your 2ltrs and testing for ketosis - did you drink your water all at once or was it spaced evenly throughout the day? Alternatively you might just be one of those people who goes into/stays in ketosis very easily.