This guide will let you know how to cure yourself from being poisoned in Stranded Deep. Follow the steps in this guide to make an antidote to heal yourself.
To make an antidote, you have to go to the crafting menu and select the Coconut Flask, as shown in the image below.
You have to search for the PiPi plant on your island; all the islands have only one PiPi plant. You have to pick it up when you find this plant, as shown in the image below.
Now, you will need to craft the Flask and the PiPi plant, and it will make an antidote for the poison, as shown in the image below.