Ok...Here's the thing.
Hanks wanted soooo much cash to do the movie, they had to economise on the little extras.
No set, no cast and no love interest.
The budget was so tight that in the second last scene on the 'island' (a pile of dirt in a puddle in the back carpark at Warners),,,,if you watch carefully, the waves (billed by the hour) suddenly shut down and a seagull is seen to get grabbed in a net and whisked off back to the 'rent a birdie dept'
And Wilson?....Well, before Tom baby swallowed the entire film budget they tried for Brook Shields as the love interest, but have you SEEN her lately??
GAAAGH !!! He (like me) would have taken one look, leapt into the sea and swam home.
So someone in the crew spent the entire remaining budget on morning tea.
When the director told him a coconut was all they could afford as a love interest unless he handed back some cash Tom said...
"Hey,...what do you want?....Blood ???"