To charge your Druid pouch in OSRS, you need to collect Mort Myre fruits from the swamp. Take your blessed silver sickle to the swamp area and cast Bloom near logs, bushes, or twigs.
This spell creates harvestable Mort Myre fungi, stems, and pears. Collect at least three of these items and click "Fill" on your pouch to add one charge.
For maximum efficiency, I recommend dropping your pouches on the ground while collecting items.
This prevents ghasts from depleting your charges during the gathering process. You can obtain up to six items per Bloom cast.
When your prayer points run low, head to the Nature Spirit grotto in the southeast to recharge at the altar.
Each ghost encounter uses one charge from your pouch, making it crucial to maintain an adequate supply for Temple Trekking.
If you find the charging process time-consuming, you can buy OSRS gold and purchase the Ouroboros pouch, which provides unlimited charges for ghost encounters.
The Druid pouch becomes available during the Nature Spirit quest, and you can find empty pouches spawning inside the grotto near the altar of nature.
After making a ghast visible with your charged pouch, you can defeat it and speak to the Nature Spirit for a reward after killing three ghasts.
Remember to recharge your pouch before starting Temple Trekking activities, as ghasts can attack both you and your follower during the journey between Paterdomus and Burgh de Rott.