"I thought there might be a few quibbles about it not being for cancer research but everyone I talk to sees it as just a worthy cause."
The 24-year-old admits going a month without drinking will be quite a change in habit for him.
"I am a pretty social person. I like to catch up with mates at the weekend, go hunting and have a few beers."
While he is nursing a broken hand, Knowles' recreational options in the weekends are a bit limited.
"I'm looking forward to having a good clear head on a Sunday morning. I used to be into running when I was younger, so I plan to get back into that and get fit."
"I think the reason people aren't speaking out about their mental health is because they don't want to be known as that depressed fella; even though very few would ever judge someone for it. And personally, I think if someone was judging, they probably have their own issues going on."
But he believes attitudes are improving.
"If you talk to people from an older generation about depression or mental health, they'll tell you that it just simply didn't exist back in their day, or it was a case of 'toughen up mate'.
"It has a lot to do with that classic male stereotype; the tough guy attitude — like you are too soft if you show your feelings. This needs to change big time."
Knowles hopes to raise $10,000 for the charity.
More about the fundraising drive can be found on his Givealittle page: Dry July for Mental Health.
Where to get help:
Rural Support Trust: 0800 787 254
Lifeline: 0800 543 354 (available 24/7)
Suicide Crisis Helpline: 0508 828 865 (0508 TAUTOKO) (available 24/7)
Youthline: 0800 376 633
Kidsline: 0800 543 754 (available 24/7)
Whatsup: 0800 942 8787 (1pm to 11pm)
Depression helpline: 0800 111 757 (available 24/7)
If it is an emergency and you feel like you or someone else is at risk, call 111.