25 Water drops
This is similar to Level 575. You need to chase the spiders into the empty nests to get rid of them. If they aren't out of the way, we can't get to the water buckets. There are quite a few and as its a small board its harder to get them. Not impossible though.
The biggest problem is the rabbit. Its not so difficult to get the carrots, the problem is when you stun him to keep him still, its harder to get around the board.
Just keep persevering and you will do it. But you will need to get extra points on the other crops you need to get everything collected.