Giving a player a potion

I am making a plugin with kits. One of those kits has Regeneration 2 10sec and Speed 10sec. I want to know how to give a player a potion. I have looked at this thread which doesn't help but links to this doc which also doesn't help me, I already know how to create an item stack. I did some of the searchings on my own and found this doc which I don't understand a thing of!!! It tells me that the extensions of an effect are a boolean.

I don't understand a single thing in all of these docs and I need some help, can someone give me a piece of code (I don't want the whole code) of how to do it with explanation of what the args mean, that would really help.

 

Here's a snippet of code from one of my 1.8.8 plugins, Sabotage.

PotionEffectType type = PotionEffectType.getByName(effect);
Potion potion = new Potion(PotionType.getByEffect(type), pot.getPotency(), pot.getSplash() , pot.getExtended());
result.add(potion.toItemStack(pot.getAmount()));

Now here is the general format:

Potion potion = new Potion(PotionType type, int potency, boolean spash, boolean extended);
potion.toItemStack(int amount);

potency - what level is it?
splash - is it a splash potion?
extended - does it last longer?

I don't know what version you're working with, but if it happens to be 1.8.8, this code will work.