This is the 9089th most frequent Japanese word.
滴っ
"滴っ" is the stem form of the verb "滴る" (shitat?ru), meaning "to drip" or "to trickle."
The word "滴っ" is used here to describe the action of water dripping from the bottle, emphasizing its dynamic occurrence.
冷たい水が瓶から滴っている。
Cold water is dripping from the bottle.
In this sentence, "滴っ" conveys the action of sweat dripping, highlighting the physical situation.
彼の額から汗が滴った。
Sweat dripped from his forehead.
Here "滴っ" illustrates the dripping motion of rain, giving the imagery of how it flows along the frame.