There's antoher Hut near the Altmann. It's the Zwinglipass- Hut, 1999m south of the Altmann. It's a SAC-Hut of the Section Toggenburg. For more Information see http://www.kletterwand.com/sactoggenburg/zwinglipasshuette.htm
If you want to Camp, there's a beautiful site just behind the Seealpsee. It's within 1 h from Wasserauen. Just tell the people at the Hut at the upper end of the lake that you're there and for a modest fee you can camp where ever you want!
"Got tight last night on absinthe and did knife tricks. Great success shooting the knife into the piano. The woodworms are so bad and eat hell out of all furniture that you can always claim the woodworms did it."