35 Water Drops
I think the water is hardest to get here despite the water buckets.
You do have water bombs which means that you need to make water jump up to above the ice and make a row to break the ice and get the bombs. With any luck it will also make a +5 row meaning you remove the other water bombs too.
You need to add points on to your crops by making combinations. Always grab the higher points rows first.
Make as many of your rows around the water buckets so that it makes your water. You only need 40 but as I said earlier, its the hardest to get.