Creek water might be inadequate depending on the characteristics of the land. Also, arguably you would risk introducing patogens (creeks are usually inhabited by gammarids which are vectors for many parasites and patogens).
If you want to speed the process, use plants, decoration, substrate or a filter from an already stablished tank. If you don´t have any, maybe some friend has and can give you something to use.
Anyway, if you make daily partial(20%) water changes and clean regularly, you should be able to keep the shrimp in the tank while it cycles.