@ Ritual:
You only use one jar of water and you\'re ranked what, 127th? EEP!
I\'ve always got 2 glasses of water in front of me, one big one for rinsing out my brush, one small one full of distilled water, which my mother scores for me, what with her being a laboratory technician and all. The distilled water is for thinning of paints. There\'s all manner of minerals and whatnot in regular tap water, and it can sometimes give paint a chalky finish.
I\'m big on thinning paints down. A lot if I\'m layering/feathering, just a little if I\'m wet blending. I love acrylic retarder medium.