My chemo doesn't drink water from plastic cup but I can't find solution for long time, until I found a perfect solution from neptonion, a chameleon water feeder's brand. hope it helps.
I am trying this waterfall from Amazon: https://www.amazon.com/Neptonion-Chameleon-Drinking-Fountain-Amphibians/dp/B07YDRFCJ1/ref=sr_1_8?dchild=1&keywords=terrarium+waterfall&qid=1606943792&sr=8-8
Currently have a dripper, but it is hard to keep up a constant slow drip.
https://www.amazon.com/dp/B07YDRFCJ1/ref=cm_sw_r_cp_apa_i_gCWtFbE51JCKP
This is the one I bought, I had to run a vine in front of it so she had something to stand on but yeah