Yes Jam, I think that's still the official position, that before the flood most of the water was just floating around in the atmosphere, so the moisture was enough for plants, there were no rains. It was one of the reasons why the people in Noah's time didn't accept that a flood is coming, because they never saw water falling from the sky.
Edit: I was wrong, I found an article in w98 1/15 that says we don't know if there was rain before. I remember for sure I heard a public talk after '98 saying there was no rain. The speaker probably wasn't up to date with new light - no wonder, it changes more often than my underpants (and they stink worse too).