making a low-poly liquid via shader

[nimble spear]

copied line-for-line from https://www.youtube.com/watch?v=7iEkCo36cvY. slight issue though, you can see through the corners of the mesh

should I just set a threshold or something for what verticies are affected?

oh ok

triangle order woo

[nimble spear]

I need help fixing transparency

ok so apparently one of the options that isn't just "alpha" seems to work fine when its this all-or-nothing texture