ok here is a quick guide about what you can do when you know that you are going to die from shroom of doom.
Step #1: find out if someone is online and not afk
Step #2: tell that you are poisond and that you have no chance to heal
Step #3: both of you teleport into teleportalsroom, make sure saviour is there before you
Step #4: walk in a corner and drop your rosto
Step #5: feel free to die
if you can not do step #1. go somewhere inside .. a quiet place
if you fail step #4
if you know other strategies post here.
If you are poisoned from Mushrooms you can go to aluwen and let her heal you for free.
Or you walk into KF /which is no drop to the present day. You die and loose nothing
But it is recommanded to use the 'Sto All' button near a storage. Dont worget the items you wear.