How can I keep water from going out of the shower?

I live in a single wide mobile home. My bathtub does not have a shower door on it, so I have to use shower curtains. My problem though is that whenever I am taking a shower, the water always ends up on the wall and floor from the sides of the tub, because there isn't anything there to stop it. I know you can buy things to help with it, but I am really hoping a DIY-er here has a homemade fix for it

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