Anti-drip bleach bottle cap with spout, should fit most 1 or 1/2 gallon bleach bottles. I printed in PLA (maybe not bleach safe over time, we'll see). I reused the seal from the original cap (with a new hole cut in it) to prevent drips. I printed the main part on its side with tree type supports, but other orientations may work also. 

Note that the top cap simply snaps on, so the bottle will leak if set on its side / tipped over. If you have children or pets, please always store your household cleaning chemicals out of reach in a locked cabinet.