What can you put under the soap to keep the drippings from pooling?

a sponge, a footed plastic soap holder, saw a wooden tiny box with slates so soap could dry out.

try alittle steel wool not brillo the real stuff

I have a wire basket hanging on my shower head. Once or twice a year, I soak the basket in the sink or bathtub to wash the soap off. ☺️

A small sponge

I use the very common plastic footed elevator found at the dollar store.

Keep your bar soap in a separate soap dish. I make and sell soap and recommend to others to remove the soap dish from the shower/tub when you are done to keep it dry and to prevent it from disappearing and dripping.

Think Heloise and her forever use of nylon net!