Is too much water, too much

[JOBRLA]

Greetings all,

This is something I have always wondered but felt to stupid to ask. I have been working with a recipe for a flaked corn/cracked barley wheat/cracked wheat malt and 7 gallons of water.

I have always wondered once I complete the cooking of all items, would it be advisable to use 1 more gallon of water and rinse the brew bag out to get the last of all the wines, or would that dilute the batch too much for fermenting?

I have read a lot and studied but haven't come across anything about too much water in the batch.

Thank you for any advise