..... but pee through a tea strainer to catch the stone, if it's small. I'm not joking.
I'm not joking either when I say that I passed a kidney stone into a milk bottle some years ago. I took the "evidence" into my doctor's surgery in Bath for her to check out, and to ask her what she thought. She held the bottle, complete with what actually looked like a vey small shrimp in it, up to a bright light and replied "I
think that I'll never drink milk straight out of a bottle again"!
Jack
PS Drink lots of cranberry juice too - it's marvellous for sorting out kidney infections, which I believe it does because something in it stops the infections from adhering to the bladder wall.