Mrs Carter's lava lamp!

Here is my attempt at making a lava lamp in lockdown...hope you enjoy? The ingredients and things that I have used for this science experiment are; an empty plastic bottle 1.5 litre (see through) you can also use a smaller bottle such as a 250 ml, some cooking oil (make sure you ask Mum or Dad first!), a few drops of food colouring or dye, a bit of water to add and an effervescent tablet (or Berocca) or you can use table salt as a substitute? Please keep the bottle away from under 3 year olds.