Horse Veterinary Questions? Ask an Equine Vet.
Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
It is common for horses to drink water with bleach added and since he did not drink the entire amount of the trough, chances are good that this will not harm your guy. It is good that you fed him rice bran and that he drank more water. It may help to give him electrolytes at this point to dilute out the water that he ingested with the concentrated bleach water but even that amount will not harm your guy. Do this every 4-6 hrs diluting out the bleach and he will do well.
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The bleach will cause a caustic burn to the tissues of the esophagus and stomach so signs would include difficulty swallowing and ingesting food and water. This is extremely unlikely but good to watch your guy. Since you have diluted this water, it is more likely that you will not see any signs.