Yeah that's what I was saying lol.A single betta in 5 gallons doesn't need 3 ppm ammonia to grow enough bacteria, a single betta will make a lot less than that. I used 1 ppm to cycle a 25 litre (6.6 gallon) tank for a betta and that was more than enough.
To measure small amounts, look for 1 ml syringes (eBay/Amazon or your local pharmacy). These come graduated in 1/100 ml. If you buy one in person, ask for a babies' medicine dosing syringe - I asked for just a syringe and I got the third degree as to why I wanted it
1ppm should be enough for the tank. I just had to do the math for her and show why it was that amount. I wanted to answer multiple questions at once