Does the blessing before the meal exempt the blessing for drinking after the meal?

Hello, A person who ate or drank something before the meal in a way that is not connected to the meal and is not exempted by the Birkat Hamazon of the meal, for example, drank water before the meal and was not thirsty to the extent that it opened his appetite and did not drink at all during the meal, and afterwards ate a meal and recited Birkat Hamazon, and now wants to drink again, does he need to recite the first blessing again since Birkat Hamazon is considered a conclusion and distraction from everything that was before, as explained in Siman 190, Se'if 1, or here he does not bless because his first drinking was not related to the meal at all and is exempted by his first blessing?

Hello 

The blessing exempts what is drunk afterwards. 

Have an additional question on this topic or need clarification? Leave your comment below. (Please note that the comment will not be published but will be sent directly to the answering Rabbi for review and a private response)