One possible solution to this is to use a two-drone rescue system. The initial drone is just a small aircraft with a camera. The follow-up drone is launched after the victim is found. The second drone is a heavier "cargo drone" that drops a 10-15 pound package. This is efficient because the cargo drone does not have to fly a long search route ... The target of the drop is already located.
SAR is like real estate - the three most important things are location, location, and location. Once you have found the victim with a UAV, you most likely will want to get an actual human, preferably trained, on scene. Your victim will probably need first aid, or at least a fairly thorough assessment. You could send in some supplies, but a priority will be boots at the scene, and the development of more information.
Hikermor has a key point. In almost every case, if you located the subject of a search, the very next move would be to get a trained rescuer on scene ASAP. In most cases it should be possible to get a helo to any location located by a drone (though that might involve winching someone down from a hover). I would think it would be an very uncommon situation where one might send in supplies before a rescuer. Possible, but unusual.
This brings up another point. The above discussion seems to assume that the subject has been positively located. A very likely case is that observation by drone locates a possible subject, or perhaps only a possible clue. A bit of color showing through the vegetation, is it the subject, a bit of clothing the subject discarded, or just some litter? A shape in the shadows that looks vaguely human? A few degraded footprints in a muddy patch, are they human or just a critter? I think almost any case that one spotted something interesting from a drone, the IMT would want to get some highly trained boots on the ground ASAP.
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