Quantity   Component name
1 × ESP-12F WiFi module - ESP-12E will probably work
1 × Raspberry Pi Any HAT compatible Pi: A+, B+, 2B, Zero
6 × 33 ohm resistor
1 × thing to stick the ESP-12F on perfboard, cardboard, a graham cracker, Pi Zero, etc.
1 × 2x20 HAT Connector (optional) run of the mill dual row 100 mil 40 pin female header. or just solder to the Pi Zero