Easy, but colorful spectacular lamp.
Step 1: Drill the Hole
For drilling glass you'll need some patient.
I've did it with a diamond coated tool. Wolfram-carbide tool is usable too.
Cooling with water is optional, but it's the easyer way.Some plasticine will help .
After the drilling clean the bottle inside and outside carefully, and let it dry.
Step 2: LEDs, Assembly
I've got some slow color changing Leds.
Easy to use: just add a resistor, and a power supply, and it works!
But carefully: Led needs current to work. This type needs max. 20 mA.
Less current= more Led life.
I've got an old Nokia power charger (other mobile charger suitable too).
With 470 ohm resistor the maximum current not exceed 12mA => great:)
Some copper wire ( .5 mm dia), 5 minutes soldering, and it's done.
Install it to the bottle, and fill with (for example) sea salt.
Give it to somebody, who will enjoy it:)
ps: Sorry for my bad english..
Step 3: Cost...
It's a very low budget project.
Leds+ resistors : $2 - 5 / 6pcs
Old mobile charger : free :)
Sea salt : $0.55 /kg ( 0,5 kg left for cooking something:) )
Time ?.... 30m - 1 h + drying time.