I actually increase fluid consumption when potty training, the more they wee, the more often you can get it in the potty, the quicker they get the idea that is what the potty is for.
Have always gone in 3 steps.
No knickers, and yes there will be accidents, but with nothing on they will get toe the potty quicker.
Once they get to the stage that they get to the potty no problem, its into pants, lots of wet ones the first day, less next and so on, when you get to the point of being dry for a couple of days, back into trousers as well
Generally takes about 10 days, when we wont go far in the car and if you do, have potty will travel.
By the way am a CM of 26 years and lost count of how many children I have helped potty trained using this method.
And generally girls are around 2.5 boys nearer 3, although just had a little boy at 22 months!!!!