If only it were that simple.
A little research reveals that not only do you get N,N-
But you also get 5-MeO, and gramine, which is toxic.
Alkaloid content is variable depending on a lot of factors as well.
Drinking a phalaris brew has been done, as erowid indicates, but it's not something I would ever do.
Isolation and purification of molecules is worth it in these kinds of situations.