Using seawater for cooking offshore

I tried pasta in pure seawater once, horrible! But so save lots of trial and error, what works using seawater for cooking? I use it for rinsing rice and all dishwashing, maybe a rinse in fresh afterwards. Does half and half work for rice? Or pasta? What about soaking chickpeas? Or any other thoughts?
Ta

1:2 seawater/fresh for veg and 1:3 for pasta.

Doesn't save a right lot, but gets the caterpillars out of lettuce quickly!
 
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