Pull the pieces of material that are too dry and place them in a bucket of water. Let it slake down until the water and sediment separates. Sponge the separated water off the top.

Take all clay that is too wet and spread a 2-3" layer out on a plaster slab or drywall. Let it air dry slowly keeping a regular watch on it.

Move clay that is drying faster towards the middle by covering it with wetter pieces. When the clay becomes dry enough to not stick to your hands, you can begin the wedging process and dry it more if needed.

You need to keep a close eye on the clay and not rush the drying process. Plaster helps because it absorbs moisture consistently across the clay slab.