These are the thing you need to make sodium hydroxide
any type of container
2 carbon electrodes (you can get these from zinc-carbon batteries)
alligator clips
water
salt (non iodized salt)
power source (i used a 9v battery)

This is my 2nd instructable so dont expect it to be good

Step 1:

First you need to get water and put it in a container then mix salt (sodium chloride) in it (make sure the salt isn't iodized)

Step 2:

Next put the 2 carbon rods in the water and then apply power
(do this for about 7 hours then let the rest evaperate)

Step 3:

you are electrolyzing the salt water solution and the sodium chloride is breaking up into sodium and chlorine (warning this is giving of chlorine gas)

He is what is going on
2NaCl(aq) + 2H2O(l) => H2(g) + Cl2(g) + 2NaOH(aq)