Bread – I added more water to the ciabatta dough by accident

I agree with rumtscho that your dough is probably way too wet, but I'd like to make a few other points as well:

You don't necessarily need to add extra flour just because your dough is sticking to the bottom of your bowl. And definitely don't add any flour until your dough is fairly smooth (unless you already have a feel for the recipe). The flour will absorb a lot of water as you work the dough, so dough that seems way too wet after one minute of kneading may be fine after six.

Also, I've found that with the hook design in the Kitchenaid, dough frequently sticks to the bottom even with proper hydration. Just use a scraper to turn your dough out of your bowl and give it a fold to make sure that there isn't an underworked spot on the bottom.

As it turns out, my dough was very cold. Due dilligence: here's a full answer.

One of the requirements of yeast for fermentation is appropriate temperature. Cold dough straight from the fridge won't rise, or it will only rise very slowly. 25-30°C is a recommended temperature range for rising, although cooler temperatures can work.

Duh.