How do I prevent dying at sea on day 4

Hint 1 of 4:

Were you in Swabs Drugstore back in the city after the lottery?

Hint 2 of 4:

Did you ever go to left side shelves and LOOK SHELF ?

Hint 3 of 4:

You should have GET SUNSCREEN and BUY SUNSCREEN.   +9 points

Hint 4 of 4:

Did you USE SUNSCREEN just after the boat was lowered ?  +5 points