I drove as both Uber and Lyft briefly & I have misplaced the receipts for gas & supplies (cleaning, water & snacks for passengers), how can I still claim gas & supplies?

If you don't have your receipts then you have the option to take the standard mileage deduction.   TurboTax will ask you the questions that will guide you on how to enter and calculate your vehicle and mileage expenses and/or deductions.

When figuring expenses, you may choose between taking the standard mileage rate (which generally changes every six months to a year), or deducting your actual expenses for items such as gas, oil changes, tires, repairs, preventive maintenance, insurance and registration. If you choose to deduct your actual expenses in the year you start using your car for business, you can't switch to the standard mileage rate later. If you choose the standard mileage method first, you can switch to actual expenses in a later year.