implicit intent of blessing for unintended items

Question

What are the main positions and/or halachic consensus regarding the applicability of the appropriate bracha rishona (other than "hamotzi") originally made on a food item / drink without conscious intent for other food items / drinks that require the same blessing, that are in the same house (though not necessarily the same room), and that he likely might eat / drink afterward, but that are not in front of him at the time he made the blessing? For example, do authorities say, e.g., a "shehakol" over a bowl of soup at a dining room table, with only "stam daas" (no explicit intent) exempts even a subsequent drink of water from a kitchen sink? Does it make a difference if the eater himself goes to the adjacent room vs. a server brings it to the table - assuming we are avoiding the problems of outright hesech hadaath / shinui maqom (distraction / changing of place, that would terminate the effect of a blessing) e.g. by staying within eyeshot of the place of blessing?