Press 'Q' to open the spawn menu. Type :help in the chat to see a list of available chat commands. If you spawn with no tools or few, then use the :tools command to get all the available build tools.
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Caution:
Beware of water. Not only can water make you wet, it can also cause the terminal flying illness, but even worse; water can cause your save files to overwrite themselves!!! I know this because it has all happened to me, so be prepared to meet a watery grave if you take a dip!