Hi Naruna
one other option if you want to use specialist quail food is to buy a small amount from us or there is a trader on TM who sells it in 1kg lots. The only problem with this approach would be the postage costs, unless you can pick up from us in Upper Hutt. It works out at about $5/kg for food plus about $3 for postage I think - my partner is in charge of that one. So chook food + blood & bone is cheaper. You can PM us if you want food from us. Whichever you choose, we recommend you only buy enough that you will use it all within 3 months.
As far as worming goes, the options I am aware of are Anthel, Aviverm or Avitrol, which are for caged birds as well as poultry. One is a pink liquid, one is a blue liquid. I can never remember which is which but in my experience birds hate the taste of the pink one and will refuse water with it in it. There is also a paste form of one of them which you syringe into their mouths. My avian vet also recommended canex puppy drops for my pigeons, I can look up the dosage for that if you prefer to use it. All of these would require a 14 day withholding period unless otherwise stated on the packaging. Go for at least 14 days if no period is stated, eg for off-label medicines such as canex and ivermectin.
For a natural method, we use a lot of Stockman's friend AHE - I think there's a thread on here somewhere with people loving it. If birds have a heavy infestation of parasites you would have to bring out the big guns, but AHE works quite well as a preventative. It is basically apple cider vinegar, garlic, kelp and manuka honey. Use 2mL per litre of drinking water. So for the small amount quail drink it is best to pop down to the local pharmacy and get a tiny syringe to help you measure the small dose eg 0.2mL in 100mL. Don't fuss too much about accuracy you can't OD them. The product is available on TM and it has no withholding period. I find it especially good for chicken chicks that have upset tummies. Give them water with this in it once a week, the rest of the time plain water, unless they are unwell in which case give them a course of AHE water.
Ask any questions you wish, even if you think they are silly. You have to learn somehow and asking first is much less silly than getting in trouble later

MQ