The thing is I am not a professional farmer or have had worked in farms in any capacity. I have a technical background so doing things on my own in DIY way out of sheer curiosity drives me. Plus, I wanted to introduce myself to organic farming in my backyard. I can share with you things I bought and how I have used them, pretty straightforward stuff.
I thought about putting an irrigation system where water would be driven with gravity and into drip system. But unlike you I don’t have an advantage of rainwater. So I still kept water reservoir (instead of a continuous tap/faucet as a source) and instead used an electronic water pump and a Wi-Fi outlet that I can schedule as I please or even remote control it if I am traveling abroad (I learned hard way that which certain plants required less or more water and in this way I was able to adjust water flow/resistance in my drip system)

Here’s a pseudo-schematic that I just chalked down:

http://imgur.com/a/0exTv

These are the parts I have bought off of Amazon. If you can buy these parts from a single seller than I am sure you can save even more.

Listed prices are the prices I have paid. Currently, they could be more or less on Amazon. Some parts were bought at a Lowe's local store.

Koram Drip Irrigation 1/4" Blank Distribution Tubing Drip Watering Hose 50' Roll
$8.99	1	$8.99
https://www.amazon.com/gp/product/B013WJYKZQ/ref=oh_aui_deta...

Raindrip 381025B Heavy Duty Support Stakes, 6-Inch, 25 Per Bag
$7.51	2	$15.02
https://www.amazon.com/gp/product/B000BOAKKK/ref=oh_aui_deta...

Rain Bird T22-50 Drip Irrigation 1/4" Blank Distribution Tubing, 50' Roll
$6.69	1	$6.69
https://www.amazon.com/gp/product/B000FJX5DU/ref=oh_aui_deta...

Fastening Tape 0.75-inch Hook & Loop Fastening Tape 5 yard/roll - Black
$5.31	1	$5.31
https://www.amazon.com/gp/product/B004AF9II6/ref=oh_aui_deta...

Koram 1/4" Blank Distribution Tubing Irrigation Gardener's Greenhouse Plant Watering Drip Kit Accessories IR-D
$25.99	2	$51.98
https://www.amazon.com/gp/product/B013JPIJG4/ref=oh_aui_deta...

Prime Wire & Cable EC502608 8-Foot 16/3 SJTW Indoor and Outdoor Extension Cord, Black
$6.58	1	$6.58
https://www.amazon.com/gp/product/B006G6A2KA/ref=oh_aui_deta...

EcoPlus 728492 Eco 100 Submersible Pump, 100GPH
$11.95	1	$11.95
https://www.amazon.com/gp/product/B007KIIQF6/ref=oh_aui_deta...

Samar 5/16-in x 20-ft PVC Clear Vinyl Tubing 1ft
$2	1	$2.00
https://www.lowes.com/pd/Samar-5-16-in-x-20-ft-PVC-Clear-Vin...

Murray 2-Pack 1/4-in to 5/8-in dia Stainless Steel Full Clamps
$0.71	1	$0.71
https://www.lowes.com/pd/Murray-2-Pack-1-4-in-to-5-8-in-dia-...

BrassCraft 1/2-in x 3/8-in Threaded Adapter Bushing Fitting
$3.98	1	$3.98
https://www.lowes.com/pd/BrassCraft-1-2-in-x-3-8-in-Threaded...

BrassCraft 3/8-in x 3/8-in Barbed Barb x MIP Adapter Fitting
$3.78	1	$3.78
https://www.lowes.com/pd/BrassCraft-3-8-in-x-3-8-in-Barbed-B...

TP-LINK Wi-Fi Smart Plug, Works with Amazon Echo, Turn On/Off Your Electronics From Anywhere (HS100)
$29.99	1	$29.99
https://www.amazon.com/gp/product/B0178IC734/ref=oh_aui_deta...

Aquarium 8Way Air Flow Splitter Lever Control Valve 3/8 Inch Tube Dia
$11.76	1	$11.76
https://www.amazon.com/gp/product/B00W136G8E/ref=oh_aui_deta...

MoonCity 3-in-1 Soil Moisture, Light and pH / acidity Meter Plant Tester,Good for Gardener or planter both indoor and outdoors (No Battery needed)
$12.99	1	$12.99
https://www.amazon.com/gp/product/B017GQ9VVY/ref=od_aui_deta...

30 gallons plastic container from home depot
$20	1	$20.00

Total	$191.73