noob again

went to make oat for my dinner while washing my water bottle in pantry room... ok lor.... gt 3 bottles of yogurt bottle. 1 jz bought today n another 2 filled with water. then hor, wanna bring 2 filled water to throw away. so, need to empty the bottle 1st lo. who knows, i emptied the one fill with yogurt. argh...i wasted half of it..