Here's an article I found...
http://swimming.about.com/cs/dryland...wim_weight.htm
Weight Lifitng for Swimmers - Phase A
Weight Lifitng for Swimmers - Phase B
Weight Lifitng for Swimmers - Phase C
You obviously wont have time to use all these routines prior to the end of August, but maybe it will give you some basic ideas about what to incorporate into a lifting program.