In a microwave safe bowl, mix water, oil and food coloring and stir with a whisk.
Add lemon juice and stir again.
Add salt and stir.
Gradually add flour while stirring to prevent lumps.
Microwave on high for 30 seconds, remove bowl from microwave and stir.
Put back in the microwave for another 30 seconds then stir.
Microwave again for 30 seconds and stir.
Microwave a fourth time for 30 seconds and stir.
It should now be in a ball.
Let sit for a few minutes to be cool enough so you can handle it with your hands.
Remove from bowl and put the play dough ball on a plate, covered in plastic wrap to cool completely.
Wrap cooled play dough in the plastic wrap and store at room temperature. If stored properly it should last a long time. We've made ours a few weeks back and it's still good to use. The girls take really good care of it.