Someone I know told me he does this.
Get a travel sized mouthwash. Take the mouthwash out (but save some in a glass). Put your desired SERM in the mouthwash bottle (for example if you are going to be gone for 7 days at 20mg, put 7 ml in the mouthwash bottle). Put a little mouthwash back in to give it the proper color (but calculate that amount into your daily dose). Then it just looks like an almost empty travel mouthwash. Also carry your oral syringe in a different bag.
This is probably way over the top, but better safe than sorry!