In Chapter 1, as Abi and Emma break into the cabin to obtain their bags. Keep the Toy.
Later in Chapter 5, Abi will leave her bag (with the toy) in the Kitchen.
Recommended killing methods of the characters: Jacob - In Chapter 1, steal the rotor arm, and later in Chapter 3, at the lake dive in after it. When getting tangled, repeatedly "Pull" instead of untangling and Jacob will drown.
Emma - In Chapter 4, open the trap door before searching the bag on the island and Emma will die.
Abi - In Chapter 6, do not shoot Nick when he is transforming. He will kill Abi (also earns "Lovers' Quarrel").
Laura - In Chapter 7, do not drug Travis and be difficult to him while captive. Shoot Travis once when escaping. In Chapter 9, Travis will kill Laura as revenge.
Nick - In Chapter 8, Laura will shoot imprisoned werewolf Nick if Ryan does not interrupt.
Dylan - Make sure he comes to the scrapyard and when operating the crane, warn Kaitlyn and distract the werewolf. Fail the QTE with the torch.
Ryan - Refuse the bite from Laura and shoot werewolf Chris later in Chapter 9 to cure Max. Ryan will bleed out after killing Chris.
Max - At the start of Chapter 10, choose to swim to shore and Caleb will kill Max.
Follow all the deaths above for this playthrough so Kaitlyn is your last remaining character during the fight with Caleb. Keep running and use the beam to progress to the kitchen. Once you arrive at the kitchen, lure Caleb into the freezer with the Toy.
This will ensure Caleb dies and that Kaitlyn is your last survivor if followed correctly.
Credit to ThePugHybrid for their
guide.