Please don't use cotton wool in the water dishes. It acts as a bacteria source and also the arachnids can can their limbs tangled in bits of cotton...I have seen spiders lose their limbs this way. It's not necessary and the way Teni describes is the way to do it. Shallow lids with a few pebbles. Scorpions prefer to drink their water off leaves, they scoop up water droplets and drink them. So it's best to put some leaf litter up one side of their enclosure and mist the leaves daily. There is a really good site for Australian scorpions, but the exact address escapes me. It's 'the spiral burrow' or something....does anyone have it? i haven't kept scorpions for a long time, and haven't frequented it lately.
Cuddlykylie, if you want some help or a caresheet for spiders, send me a PM and I'll help you out.