I've been watching Lost and I fell in love with it. Then I found stranded by bloodshedbaby and was squealing like the fan girl that I am, got called crazy then proceeded to reread it so now I'm craving some more similar. The show Lost and the story stranded by bloodshedbaby.

They should be stranded in an island or a place where they'd have to hunt for food

Castaway by RipeWickedPlum has them on a desert island. It is a WIP though.

ScoobyDawn
I found it after i posted it and loved it thanks for the rec

I'm pretty sure both of these have a time where they are in an isolated setting with the need to hunt...

Offers you Can't Refuse by sweetprincipale (I think this is more a road trip than being stranded as such)
Late S.3 AU. Buffy's only way to stay alive and expose a plot by a deranged Quentin Travers involves staying out of Sunnydale and staying one step ahead while Giles finds a way to save her life and get the evidence to stop the corrupt Head of the Council. But who watches the Slayer's back when she's the prey? Someone makes Spike an offer he can't refuse- but not what you'd expect.

The Keeper of Truth by Trisha
"There's always consequences." Spike is proven right when Willow's spell brings Buffy back, years from where she's supposed to be. He'd be bragging that one up, if Spike of season 2 knew what the hell Buffy was talking about.

Legacy by Kyra Storm [NC-17]
http://www.dark-solace.org/elysian/viewstory.php?sid=1000
This story is based on Challenge #87 on the Bloodshedverse, issued by Bloodshed Baby. The challenge reads like this: Another early season "lost somewhere and having to rely on each other to survive" Spuffy story in the same vein as Castaway, Stranded, The Game series, etc. (Oh come on, you know these kind of fics are fun). The challenge? Trying to come up with a plot/story line that is somewhat unique (or not) yet keeps us on the edge of our seats. Can be time travel, stuck somewhere, kidnapped, etc. Set in Season 3, after Lover's Walk, Vampire Council decides to punish those responsible for the state the Aurelius line is in and kidnap Buffy and Spike.

Promise of Frost by Eurydice [NC-17]
http://www.dark-solace.org/elysian/viewstory.php?sid=430
When a snowstorm strands Buffy and Spike, they are forced to turn to each other for strength, especially when a missing Giles, mysterious visitors, and way too much magic threatens to turn it into a not so very merry Christmas. Set mid-S4. - Complete

His Girl by dreamweaver [NC-17]
http://www.dark-solace.org/elysian/viewstory.php?sid=2165
Buffy loses her memory when she and Spike both fall through Glory's portal.
Winner Reader's Choice for Best General Long Fiction and Best Buffy Characterization in the Spuffy Awards, and nominated for Best Long in the Rogue Poet Awards!

I think Slaymesoftly has one, but I can't figure out which.

Not slaymesoftly, I was thinking of this one - Not Your Ordinary Walk in the Park by Sandy

http://www.bloodshedverse.com/stories.php?go=chapters&no=1572

After Buffy enlists Spike's help in fighting a strange demon, it sends them to another dimension. There, Buffy discovers to her distress that she must rely upon Spike for her very survival. And then things get really interesting.