For a good thunderstorm enema, Try to plan one using, "Weather For Us" It gives precise, easy to read, rain pre-dick-ions. You can have your stuff all set up, awaiting the happy day. The anticipation is fun and extra fun with a participating partner, or antagonist, either way. Then all you have to do is add water. Catching and claiming fresh rain water might be too cold. But in the 1800s and early 1900s, Great Depression, fresh rain water was popularly caught out in the country, just for enemas. Making a rainy day really special, just heat it up a little bit. With a wood stove, and nothing better to do, they would sing and laugh, getting it ready for Paw, or Maw. Now we can still do it with a rain gutter on the house. This flair of old timey fun is exciting. Promise one for your lover and see for your self. Run it through your coffee pot filter system, to strain off any serious turbidity. Add a little salt too, if you want, for good measure,, a real gourmet event. See if you can interest any takers, maybe a neighbor will want to take some in with you, or watch. As a handy man, you could design and offer to build enema water collection systems, for friends, family, along with hyped ideas for a pseudo science, rainy day fetish. (just don't call it that) Write some proposals up and pass them out down the street. If you have been wanting to put rain-gutter over the front porch, this might be that extra, that kicks starts the old project for you.