it is, by drinking way to much. When I was pg with my last child I developed a condition caused by being pg where I hypersalivate the entire 9 months of my pg(pregnancy). The only way I could get relief was to suck on ice all day. My husband had to go buy bags of ice for me from the store of which I would go through ever couple of days.
I told my doctor and she told me to be careful not getting to much water, so I limited the amount I drank when I wasn't sucking on ice.
I drink at least a gallon of filtered water a day. More in the summer. My doctor always said this is good.