How can i make the player change his body size when he is drink something?

i want make one game with drink something but i can't write the script, when he drink his get eight and width (i am sorry my english is bad)

script.Parent.MouseClick:Connect(function(Player)
    local Character = Player.Character

    local Humanoid = Character:FindFirstChild ('Humanoid')

    if Humanoid then
        local BHS = Humanoid:FindFirstChild('BodyHeighScale')
        local BWS = Humanoid:FindFirstChild('BodyWidthScale')

        if BDS and BWS then
            BDS.Value = BDS.Value + .1
            BWS.Value = BWS.Value + .1
        end
    end
end)

i put this in the tools file