In the PC version you have to unlock the water tower in story mode. In the console version you have to unlock it in your plans.
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Build 2 huts and 1 chair
In order to get plans for the shower and outhouse in sims 2 castaway you need to build a house or shelter plan called Compact Burgalow. Once you finish building it you'll automatically get the plans for it but not the materials needed
In order to have a shower, toilet, ect... you have to FIRST build a cabin and THEN build TWO cabin living room chairs. Then, when you've done that it will say "New Plans: Outhouse & Shower plans".
There's no game sims castaway, just sims casaway 2.
by the piers in the East Beach