UPDATE:
I just caught him drinking it out of his bowl from yesterday night to this morning. He does have an odd eating schedule so it was hard to tell. Nevertheless, thank you for your responses!
We caught a feral cat, coaxed it by feeding it everyday, then finally opened door it lead itself inside the house. It's still skittish to strangers, but it's showing signs of trust and coming out frequently to play, be pet, eat, purring, talking to us, etc.
The problem is, it doesn't want to...
