Just like the title says, imagine your characters are stranded together on a deserted island. How would they react? Would they be scared? Angry? Weeping buckets? If they could only bring three items with them (per character) to the island, what would they be, assuming there's no cell service and that the water surrounding the island is too choppy to provide any means of escape? (Meaning no canoes, rafts, or kayaks will be of any use.)
Now, using your characters, show me what your deserted island experience would look like! 
Sunni: Oh God, where are we now?
Myung: What are you, illiterate? Look at the title and try to keep up for once.
Sunni: Geez okay, fine. What did we bring?
Tara: *Looks around with wide eyes, trying not to freak out. Uh...I mean, I packed sunscreen, and... *Drops her purse to the ground and starts rummaging through it for several minutes before pulling out a bottle of water. This! Oh, and I think I brought sunglasses too somewhere.
Sunni: So far so good... *Scans the area until he spotted Jae trying to drag Sang away from the ocean. What now?!
Sang: *Throwing a toddler trantrum Noooo!!!! I hate sand!!! It gets everywhere and I'm too famous to die with you losers!!! Let me go! I'll swim back! I can make it!
Jae: *Holds Sang by his ankles, the other idol clawing at the ground to pull himself closer to the water. Sang, you can't swim!!!
Myung: ...well, we're gonna die. But at least I brought a lighter.
Sunni: And...? That's it? Just a lighter?
Myung: ...and car keys. Don't judge me.
Sunni: *Face-palms. Okay, and what did you bring, Chung-Ae?
Chung-Ae: *Takes a long sip from the bottle in his hand and sighs. Three cases of beer.
Sunni: *Huffs, rubbing a hand through his blonde locks in frustration. Well, thank God I brought a first aid kit and some snacks!
Myung: Literally no one wants your healthy garbage snacks, Sun. I'm pretty sure Sang and Jae would sooner eat their own makeup before they'd touch that nasty shi-
Sunni: *Interrupting quickly Joonie! What did you bring?!
Joonie: *Looks up from the sand castle he was building.
We were supposed to bring something?
Myung: Just so we're all clear...I'm voting him off the island first.