Liner for kitchen cabinet

[Mich Copper]

Can anyone suggest a good and inexpensive way to line the kitchen cabinets in my rental, for both the shelves and the floor area under the sink? The cabinets are made out of MDF so I want to avoid water damage as much as possible.

Ideally, for under the sink area, I imagine something like a drip pan but I'm having a hard time finding one that fits.

Thanks