Asthma and Open Water Swimming

Hi! I'm new here and have recently become interested in doing some open water swims. Unfortunately, the local masters team doesn't work for my schedule, so I am going at it alone. I was wondering if anyone had any advice on how to handle asthma when out in the open water. Even though my asthma is much better than when i started swimming again 6 weeks ago (i would literally be getting out of the water wheezing wiht blue lips), I still am concerned. The thought of exercising and being so far away from my inhaler frightens me. Does anyone have suggestions on how i can carry and/or take my inhaler while in deep water? Thanks alot! Nicole