First, let's get right on the terms. Overwatering is NOT the amount, but the frequency.
When you water, you should totally saturate the medium until run off (water comes out the bottom), and then let it dry. Usually 3-5 days, Then water again.
Little 'sips' every day or so is overwatering, where your medium is always wet and a quick way to kill/stunt your plants.
Wet