By Tanner Garrity Though I’ve banged the drum on cold-water therapy for years, I’ve never been able to make it a consistent part of my fitness routine. The issue is access. I habitually partake in ice-cold, “Scottish” rinses at the end of a shower, and whenever I’m on vacation near a coast, I make sure to jump into the surf after each morning run, but neither practice is as productive or as permanent as I’d like it to be. Blame New York living. My closest body of water is the Gowanus Canal. Dolphins might’ve made a cameo in the East River last summer, but it’s hard to imagine the health benefi…