Gan,
I not sure how big your drift wood is, but I do have a fibric tank of size 2x2x1.5 feet outside my flat if you need it please let me know.
Another way is when you bought the drift wood request the store owner of the fish store to soak it for you.
Usually hot water treatment twice for the wood for 24hrs is good for me. And if the wood did not sink after the 24hrs period I usually find some rock as a counter weight to make it sink for a month and then periodically check if the wood ready to sink by itself.
Best Regards
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