How do you make a Life Vest-type-tool?

Hello everyone this is my first question. I am making a diving game and am wanting to make a Life Vest. I want it to force the player to the top of the water and I have no idea how to do this. Any help?

Solved this by myself. Here is my code in a Local Script. -

local p= game.Players.LocalPlayer
local tool= script.Parent
local State
local Info = true
local StateHelp = true

function equipped()
	Info = true
	StateHelp = true
	while Info == true do
	wait()
	State = p.Character.Humanoid:GetState()	
	
	if State == Enum.HumanoidStateType.Swimming then
		if StateHelp == true then
	script.Parent.BodyPosition.Parent = script.Parent.Handle
	end
	StateHelp = false
end
	end
end

function unequipped()
	wait()
	Info = false
	if StateHelp == false then
	script.Parent.Handle.BodyPosition.Parent = script.Parent
	end
end

tool.Equipped:connect(equipped)
tool.Unequipped:connect(unequipped)