During the fight of Harpies, right outside the Druid's Grove, 2 of my companions died in the water. After to battle I tried to use scrolls to rez them and was not able to target them even while standing on them.
Quick note: you won't be able to "end day and go to camp" with dead members. But if you open your map (keyboard shortcut m) you can use the quick travel there to go to the camp even with dead party members.