Easy Drug Rehabilitation

When a person drinks too much of water sodium content of the
body breaks creating toxic fluid in the body dangeraous for
human body. Specially for those loke dehydrated athlets who
has already lost electrlytes from body if drinks too much of
water gets highly toxicated. Then what is the solution?

I have heard too much water for your baby can be bad. But how much is too much? My little boy is 6 months old and drinks about 4-7oz a day (not all at once) as well as his usual 4x 7oz bottles of formula and 2-3 solid feeds a day. I am just a bit worried that this is too much.
He drinks between 4 to 7 oz of water a day sometimes less but never more