I don't wet now, but when I did (until my mid teens) I had to keep a log for the doctor. It was a series of pre-printed A4 calendar sheets with 2 outlined weather symbols in each day square, a sun symbol for dry and a rain symbol for wet. The appropriate symbol had to be coloured in (usually the rain symbol!), in later years when I felt colouring was too juvinile, I circled/doodled around the symbol.