Ms Johnston said the idea "completely took off on Facebook" with immediate orders from a family of six children and a delivery order from a family of three children.
"It all started when I saw children walking into kindy with just a little sandwich for lunch, or sometimes nothing at all.
"I decided I had to do something because children need food to sustain them throughout the day."
She said it wasn't a decision she took lightly, but in the end she thought, "If I feed these kids, then at least I know there aren't children going to school hungry or being kept home from school because there's no food in the cupboards".
"I mulled over the idea for a few months and then about a week ago decided to put a call out on Facebook to see if there was any interest.
"Within 48 hours I had hundreds of comments, likes and private messages and I just thought to myself, wow, there is so much demand out there, I have to follow through now."
She said she was driven to help out because she didn't want to see children suffer.
"I just want to see kids going to school with enough good, healthy food so they can concentrate in class."
Ms Johnston said she wasn't out to make a profit, all the money went into buying for the next day's lunches.
"It was never about making money, I just wanted to be able to do something for my community and show people that if we work together, we can support our young ones and give them the best start in life."
- To make an order for Ms Johnston's lunch packs, call (021) 064 1643 or visit Facebook page, Glenholme Lunches.