RNY Surgery in 30 days-advice on how to prepare?

I feel like I should be more prepared for the surgery since it's only 30 days away. I'm not talking 'mentally' prepared, I'm talking about supplies, OTC meds that help, any other items that I will be needing post surgery that I should have now. I'm told walking about surgery helps a lot as well as protein powder and whey powder. Can anyone offer some advice?

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