Using poison potions is really cluncky, you have to open your inventory and place it on your weapon in your hotbar. I have tried using them for some time now and it happened several times that I did not place it on my weapon but a little bit above, making me drop the whole stack on the ground.
What I am suggesting is: Make it possible to place the poison into your hotbar, when activating it / using it one of the bottles gets placed on the weapon you are currently holding in your main hand (and only if it’s possible to use poison on them), kind of similar how it works for bows as you can place different arrow types on your hotbar and then switch them around by “using” them (pressing the number they are on).
This would make things so much easier and actually fun to use because as it is right now, poison bottles are just an annoyance.
You can’t really time the poisons to keep the stack up because you have to go to your inventory and place it on your weapon and accidentally dropping the poison in the process of placing it on your weapon is beyond annoying, sometimes it’s not even worth looking for the bag afterwards if it rolled down a hill.