Extract Your Own Dna From Blood

things you need
distilled water
sodium chloride (salt)
blood
containers 
rubbing alcohol
proteinase k  (optianal)
dish soap

Step 1:

the first step is to get some blood and put the blood in a container then put in a little water in it (distilled water)

Step 2:

next add the proteinase k if you want, then add the dishwashing soap and mix

Step 3:

The final step is to add the rubbing alcohol (make sure the two layers don't mix) and let this sit for a few minutes and then you are done.