here's the other drown: http://archive.org/details/tsp1992-02-05.shn
it was added to a promo/in-house tape that had a recording of a show in paris.
as far as i know, it's not actually confirmed that this is the waterfront studios version. people just assumed it was, because they knew about it, and then one day this alternate version of drown showed up, so this had to be the waterfront studios version. ("more than two versions of drown? impossible!")