[Spoilers below]
She does indeed drink the tea! XD
Here's the text as for what happens if you try drinking it without seeing both endings.
(If you haven't finished any route yet)
$ ex = "neutralfrown"
A "…{fast}"
$ ex = "gone"
M "Anything?"
$ ex = "plz"
A "This tastes like you dipped some grass in hot water."
$ ex = "gone"
M "I’ll take that as a no."
$ ex = "gone"
(If you've finished one ending but not both)
sub "Something tingles at the back of my brain. I see one— two— visions swim before my eyes and then– nothing."
$ ex = "confused"
A "Hmm."
$ ex = "gone"
M "That’s a curious reaction. Did you remember anything? "
$ ex = "confused"
A "I… I might have? It’s not strong enough to really pick out anything concrete."
$ ex = "gone"
M "Seems like parallel-world Aimee is a bit of a slacker."
$ ex = "plz"
A "H-hey now…"
$ ex = "gone"