Hi My 2 Year Old Drank A Mouth Full Of

Hi my 2 year old drank a mouth full of watered down bleach and spit out, what I believe was most of it. He is rubbing his tongue on everything, we fed him so snacks and he is drinking a bottle of milk now to hopefully coat his stomach before the bleach has a chance to hurt anything. We tried giving him water and juice and gave him a tiny bit of mouth wash watered down. He is laying down with me and my husband on the couch watching TV and acting alright. What should I do? He spit it out and his clothes are ruined and I'm so thankful for that but idk how much he swallowed. He reached over his baby gate and stood on a toy and grabbed the small container that had the substance in it. We are worried sick.... what do we do?