If your dragon is getting fresh salad and live insects everyday ( two feeds of live each day for a dragon about 8 months old ) it is getting sufficient moisture.
Most bearded dragons wont drink from pools of standing water , you can try setting the spray bottle to a fine misting setting and misting your dragon , if it's
thirsty it'll lick the water off the furnature and off it's snout , you can also deposit drops of water on it's snout and it will drink these if it's
thirsty.