Dry ears??

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I managed to score myself a nasty ear infection through getting water in the ear. The doc says I have to keep my ears dry now. Needless to say I'm not too happy about this idea as it pretty much sidelines me from paddling. Has anyone found anything out that keeps 100% of water out and isn't too expensive? How badly will this impede my ability to hear people talking / yelling warnings etc when on the river??