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Hello. Thanks for the question.
This diluted sanitizer is usually not going to cause more than just some irritation/ GI upset. I would be sure to check in his mouth to look for any ulcers. Keep an eye on this for 2-3 days, as some ulcers can be delayed in their development. If you notice ulcers, it's best to start pain meds and antibiotics as soon as possible.
As long as there are no ulcers in the mouth, he should be ok. You can give some water and food now to help dilute things out further, and that will help prevent nausea and vomiting.
I hope this helps, let me know if you have any other questions.