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What do I do with the bare Ground wire in receptacle. 
Can I combine the Neutral and Bare Ground to the same slot, since they’re like that in the Main Panel?

By code, a 30 amp outlet must be connected to 30 amp breaker. Cannot be connected to 15-20-40-50 etc amp breaker.
Use minimum 10 ga wire .... can use larger if wire fits screw terminals. Tighten screws very tight against wire. Resource: Color code for wire

-Outlet must be installed inside electrically-rated rectangle box (deep box is easiest for heavy gauge wires ... metal or plastic). Box must match outlet. Box must have cover that matches the outlet. Buy: 30 amp outlet cover
-Cannot use homemade box, round box, octagon box, square box, junction box, pull box, etc.
-As an option, you can use all-in-one surface mount box with 30 amp outlet Buy 30 amp surface mount
Wire or conduit must be clamped to box, and box attached to structure. Movement is a major cause of electrical failure, fire, short, hazard etc.

Why? -
(a) The ground wire must be separate and provide a direct, low-resistance path for short circuit to reach the ground rod driven into soil outside home or building. This allows unrestricted flow of excess current (or overcurrent from short circuit or insulation failure) to be absorbed by earth.
 The ground is first line of defense against injury and damage ... assisting the circuit breaker (overcurrent protection) absorb excess power and minimize damage or melting of wires and devices ... and help protect against personal injury.

(b) Neutral wire performs a different function from the ground wire, even though both Neutral and ground busbars are bonded (connected) together inside the main panel.
The Neutral carries voltage when 120 volt loads are operating.
While the ground carries voltage only when there is an insulation failure or short circuit.

Across the entire grid, the Neutral is bonded to a ground rod at every pole, transformer, substation, etc all the way back to the power plant.
The Neutral runs continuously back to the generator coils, completing the circuit for all single-phase loads, while the array of ground rods (and substation circuit breakers) help prevent overvoltages and short circuits from damaging the grid.
Resources See inside main breaker box. Electricity from power plant to household

(c) The Neutral must be a continuous throughout a home or business, and cannot be switched on-off. A Neutral is never switched. This ensures proper operation of 120 volt appliances, devices etc.

(d) If Neutral is used as ground wire, or ground used as Neutral, or both are connected together ... and there is a short circuit ... the overamperage can enter the device that is connected to Neutral wire ... and cause damage or personal hazard.

(e) A grounded Neutral is a noted hazard that is against the electric code, and can be hard to detect until there is a short circuit or while doing electric maintenance. The electrician, or homeowner would naturally assume ground wire is not energized ... except a grounded Neutral is carrying hazardous power that shows up on the ground wire and can cause unexpected injury, burns, etc, even if breaker is off. Turning off main breaker will solve the risk, but not correct the problem of a grounded Neutral.

Note about illustration:
The illustration on right shows neutral and ground on same side on breaker  box so image has enough space to show wires and connections.
Also missing is the ground wire leaving panel and traveling to ground rod.

(1) Change the 10-2 w ground cable coming from breaker box (main panel) to a 10-3 w ground cable
(2) Bring a Neutral wire over from the a nearby 120 volt outlet.

To bring Neutral from nearby outlet requires at least a 12-2 cable (on a 30 amp breaker) from the nearby 120 volt box. You can run a single wire (not a 12-2 cable, but just a single wire) if and only if you install inside conduit.