What is "bonkou" in Haitian Creole? "nou bote bonkou dlo met la"?

bonkou - a lot, many

1. Nou bote bonkou dlo mete la.
    We fetched plenty of water to have around.

2. Misye rich kounye a. Li fè bonkou lajan nan biznis li a.
   He's wealthy now. He makes a lot of money in his business.

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Mandaly, In the Kreyol sentence "Konbyen moun ki genyen nan fanmi ou?" And then the response "Gen sis moun." Is "mwen or m" in "Gen sis moun." understood and that is why "mwen" is left out? Or am I off with this? Also should this sentence be "Gen si moun?" I have learned to drop the "s" in sis, and dis, and the "t" in uit when using monetary terms (goud ak dolar). Does this hold true to the above sentence? Lately I have been exposed to more and more sentences which do not drop these letters (s ak t). I thought it was more popular to drop these letters in numbers? Am I wrong? Mesi anpil Jan Rachal

Sorry, I took some time answering your question.  I was away.
I am back home now :)

There's no "mwen" or "m" in that sentence as it is:
"Gen" stands for there is, there are, is there or are there

Konbyen moun ki genyen nan fanmi ou?
How many people that there are in your family (literally)
How many people are there in your family?

Gen sis moun.
or
Genyen sis moun.
There are six people

I would not drop the last letter here.
We do drop the last letter when using monetary terms, but some people do not drop it.

Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words

Hey I keep hearing this word that sounds like "achehhh". Is it some kind of expression of disbelief?

The word is "adye"; it's an interjection used to express sympathy, shock, surprise
It can translate Alas! What a pity! Poor thing! Oh dear! Gee!, etc...
You might hear it as

Adye o!
Adye mezanmi! 
Adye Bondye! 
Adye widan!
Adye frè!
Adye sè!
Adye manman!
Adye papa!
Adye e e!

Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words