how do I make a water balloon? I think I almost got it but I don't know

I have made the tool and everything this is the local script:

local player =game.Players.LocalPlayer
local mouse = player:GetMouse()

script.Parent.Activated:Connect(function()
    script.Parent.PickenTarget:FireServer(mouse.Hit.p)
end)

I think I have got that down and it is good

here is the script

local db = false

local directon

local debris = game:GetService("Debris")

script.Parent.PickenTarget.OnServerEvent:Connect(function(player,mouse)
    directon = mouse
end)

script.Parent.Equipped:Connect(function()
    for i = 0,-4,-.5 do
        script.Parent.GripPos = Vector3.new(0,i,0)
        wait()
    end
    for i = -4,0,.5 do
        script.Parent.GripPos = Vector3.new(0,i,0)
        wait()
    end
end)

script.Parent.Activated:Connect(function()
    if not db then
        db = true

        -- Play the animation

        local humanoid = script.Parent.Parent:FindFirstChild("Humanoid")
        local throwAnim = humanoid:LoadAnimation(script.Throw)
        throwAnim:Play()

        wait(.5)

        -- Throws the ball
        script.Parent.Handle.Throw:Play()
        script.Parent.Handle.Transparency = 1
        local ball = Instance.new("Part",workspace)
        ball.Shape = "Ball"
        ball.Material = Enum.Material.Slate
        ball.Color = Color3.fromRGB(255,255,255)
        ball.Size = Vector3.new(1,1,1)
        ball.CFrame = CFrame.new(script.Parent.Handle.Position + script.Parent.Handle.CFrame.LookVector * 3,directon)

        local attachment0 = Instance.new("Attachment",ball); attachment0.Position = Vector3.new(-.5,0,0); attachment0.Orientation = Vector3.new(0,180,0)
        local attachment1 = Instance.new("Attachment",ball); attachment1.Position = Vector3.new(.5,0,0)
        local trail = Instance.new("Trail",ball); trail.Attachment0 = attachment0; trail.Attachment1 = attachment1

        local bv = Instance.new("BodyVelocity",ball)
        bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
        bv.P = 3000

        local ori = 0

        spawn(function()
            while wait() do
                ori = ori - .1
                ball.CFrame = ball.CFrame + ball.CFrame.lookVector * 4
                ball.Orientation = Vector3.new(ball.Orientation.X + ori,ball.Orientation.Y, ball.Orientation.Z)
            end
        end)

        -- When a ball touch something

        ball.Touched:Connect(function(hit)
            ball:Destroy()
            local player = game.Players:GetPlayerFromCharacter(hit.Parent)
            if player then
                local char = player.Character
                local humanoid = char:FindFirstChild("Humanoid")
                humanoid.Health = 0
                humanoid.PlatformStand = true
            end
            local effect = Instance.new("Part",workspace)
            effect.Size = Vector3.new(1,1,1)
            effect.CanCollide = false
            effect.Color = Color3.fromRGB(255,255,255)
            effect.BottomSurface = Enum.SurfaceType.Smooth
            effect.TopSurface = Enum.SurfaceType.Smooth
            effect.CFrame = ball.CFrame + Vector3.new(0,1,0)
            local hitSFX = Instance.new("Sound",effect); hitSFX.SoundId = "rbxassetid://4518881974"; hitSFX:Play()
            for i = 0,10,1 do
                local clonedEffect = effect:Clone()
                clonedEffect.Parent = workspace
                clonedEffect.CFrame = ball.CFrame + Vector3.new(0,1,0)
                local bf = Instance.new("BodyForce",clonedEffect)
                bf.Force = Vector3.new(math.random(-1100,1100),math.random(0,1100),math.random(-1100,1100))
                wait()
                bf:Destroy()
                debris:AddItem(clonedEffect,5)
            end
            debris:AddItem(effect,5)
        end)

        -- Reloading the ball

        wait(.45)
        script.Parent.Handle.Scoop:Play()
        wait(.2)
        script.Parent.Handle.Scoop:Stop()
        script.Parent.Handle.Transparency = 0
        wait(.5)
        db = false
    end
end)

For some reason it won't kill my NPC I tested it with a free model and gun and the gun killed him just fine if someone could please help me.

I also don't know how to make it so it only takes a little damage out and not instant kill if someone could please help me that would be great!

Thanks!