Basically I can't seem to find the bottom left tiles for the water tiles I wanted and used other ones (which I don't want to have in my game because it looks really bad). I could find them for other tiles in the tileset. (such as the dirt path that I made and the puddle that I used to "complete" the pond). Also, I apologize for not seeing it, but I can't seem to find the tiles I'm looking for in the picture. (again, I could just be seeing it wrong.)
No specific tiles exist for upside down corners, what you have to do is go the layer above the water (if water is in layer 3, lower is to layer 2) and use the grass edges with no actual liquid in them as shown in the image below and figure out how to make the bottom corners and stuff. but to let you know, you'll wanna use the regular square clear water tile and then put these around it and experiment with it until you find what works.