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