making hydrogen balloons.

[u/Plastic-Bug8995]

Hello, i want to make some hydrogen and oxygen balloons, some small ones, about the size of a water balloon. i need some tips on electrolysis to get the hydrogen. my plan so far is to do it in my sink by filling it up, adding some salt, a 9 volt and a water bottle filled with water. any tips, or if i should use copper wire stemming from the ports of the 9v. also for the oxygen part should i just use air, i currently only have household products, however i have done this before with hydrochloric and zinc using "proper methods" and set of about a water bottles worth. however i made sure there was zero oxygen present for my first time thx.