Starter Gift - How to Feed?

Yesterday I went to a local bakery co-op and was given some starter that had previously been gifted to the bakery by yet another bakery co-op, so it has good pedigree.

What I got at the bakery looked like dough, not like the starter I created myself at home, which is fairly thin (hydration level being quite high). It had just been fed and looked like a soft ball of dough.
I let it sit overnight, and it rose quite a bit. A crust formed on the top, and beneath it looks much more like starter now, stringy and active, but much drier than I am used to.
How should I feed such a dry starter?

Thanks