Armature enters camera view via inverse kinematics attached to the bones. Bones will be posed every 3 frames and animated using keyframing.
Armature walks over to the table using inverse kinematics and is posed to pick up the donut and put it to his mouth. The donut will appear to have been eaten by downsizing it until it is no longer visible.
Armature walks to the table and is posed to pick up the jug, every movement still being keyframed. Jug will be placed above the glass, pouring water into it using the fluid modifier.
The armature then picks up the glass and puts it to his mouth as if drinking it, all movements being keyframed between 5 and 10 frames per movement.
Armature puts down the glass and leaves the cameras view using the same technique that it had entered.