How do I let only one player see a Terrain?

I know that when you put parts in CurrentCamera then it only shows for the player, but how do I make the Terrain shows only for one player?

This is my script:

script.Parent.MouseButton1Click:connect(function()
    script.Parent.Parent.Visible = false
    script.Parent.Parent.Parent.TextLabel.Visible = false
    local water = game.Lighting.GoodWater:Clone()
    water.Parent = game.Workspace.CurrentCamera
    for i,water in pairs(water:GetChildren()) do
        game.Workspace.Terrain:FillBlock(water.CFrame, water.Size, Enum.Material.Water)
    end
end)

But it shows for every player.