You could try contacting the publishers to find out if there are ebooks and we're just not finding them, but I checked all the usual shops.
Water is done by Alongquin (Workman)
http://www.workman.com/algonquin/
Forever is done by Chicago Review Press
http://www.chicagoreviewpress.com/
With Water it may be a case of a smaller publisher taking the easy route. I think Sony and Amazon will do some of the grunt work to get the ebook made just to get it into their stores.
With Forever I don't know if that publisher does ebooks at all.