To be honest you shouldn't really be spraying him IN his enclosure anyway, as this would cause humidity, beardie's shouldn't have it humid in the slightest as they are an arid land species not rainforest.
To ensure Dexter gets adequate water, as he has a panic attack in the
bath, I use a small pipette out of my Son's chemistry kit (sterile and never used, as brand new sealed kit) and dribble a drop down the front of his nose so it drips over his mouth, if he's
thirsty, he drinks, and I continue with separate drops not a continuous stream, until he's quenched his thirst. I either use very slightly warm tap water, or standing water from his hamster-size bowl of water in his viv, if it's already been made fresh that day. He doesn't appreciate freezing cold tap water dribbled down his face, it has to be at his ambient viv temperature, so it doesn't feel too warm or too cold. Sometimes he gets through two pipettes full! (4ml each!) I offer him water between 4 and 8 times a day. Ensuring he won't get dehydrated again.
