There are various posts on here about people using Oragel, Ice Cubes, and taking a mint afterwards.
@Soon i will be gone Provided an excellent post last week which also contains a video explaining the mixing of these drugs. In this video, the barbiturate (N) is mixed with apple juice. I provided a link to that post below.
As an alternative you can also use a rectal form of administration, which her post also covers.
https://sanctioned-suicide.net/threads/the-ddmaph-mix.97215/