The Craft is all about using your creativity (your cunning) to find the best way to practice (or to adapt to) whatever circumstance you are.
If you don’t have a bathtub try Kasie’s idea with the soaps or…
As for coming out of the broom closet 
go one step at a time. You could just talk about a certain technique you found (e.g. a meditation/chant/oil) that helps you when you’re anxious, or describe any other witchy thing you do and how it benefits you.
Like Megan said, you know them and you probably can tell how they will react. Good Luck! 