"Puddling spot"

[Harriett Wright]

I read in a book by Thomas C. Emmel called *Florida's Fabulous
Butterflies* that male butterflies of a number of species congregate in
order to sip moisture from ground soaked with animal urine or damp spots
contaminated by dung or dead animals, an activity called "puddling",
which restores sodium and other salts lost during mating.

I'm in the process of creating a butterfly garden in my Tampa, Florida
backyard. I wonder if there's a way, short of collecting animal urine,
dung, etc. (or worst yet, dead animals!) that I could create a butterfly
puddling spot. Would composted manure from a garden center spread on a
low spot and kept moist be an adequate substitute?