Given that a conviction would likely result in a prison sentence, he could have a lot to lose. Don't put yourself in danger.
Bear in mind that laptops, smart devices and mobiles can be used to record sound and / or video, and they can even be controlled remotely. If I was calling helplines, I'd do it from somewhere safe (not in house), possibly not on my own mobile, in case he's been at that. This sounds sexually-motivated, but if he gets worried he will have the skills to keep an eye on you. In other words his mobile might not be the only device to worry about.
I'd second discreetly taking a sample of the tea. Another option is to take a sample, pretend to drink it, before discreetly disposing of it (discreet in case he's watching you in other ways). Then feign sleep and see what he tries. However that's risky to your emotional health (if he does rape you), and physical health (if he thinks you're resisting, or even realising, you don't know how far he could go - he could panic and hurt you physically, or worse, rather than be caught).
I'm not sure about Samsung, but I know some smartphones can't be opened by the police or FBI. They've taken to catching suspects when the phone is in use, out in the street, and grabbing them before they can lock it. In which case finding other sources of evidence, getting police involvement, and then getting them to seize his phone (explain you don't know the code), might be an option.
The only easy way to get at two pieces of evidence is (1) going to hospital and requesting an exam for rape, a day when you are suspicious and (2) getting the tea tested for drugs. However, can completely see you'd not want to put yourself through another night with him.
I think that, given how much there is at stake (prison), you would be very unwise to talk to him about it, giving him a chance to destroy the evidence, or hurt you. If this was just the videoing when you're asleep on the sofa it might be worth discussing, but there are too many suspicious items here, which put together do look like something pretty dreadful.
So sorry.