I have over a hundred chooks atm. Dont quite know how that happened
1. the reason for no treats....its is difficult to know EXACTLY how much flubenvet to give each bird as it depends on their weight. By mixing the wormer into the pellets as per directions (or use the medicated layers pellets from I think Marriages) then the doseage is easy, as the bigger birds eat more than the little ones. This is only going to work if they eat nothing else, hence the no extras rule.
2.If you have fewer birds, and you know their weight and EXACTLY the dose to give each one, then you can give that dose to each chook by whatever method you choose, be it on a grape or in porridge etc, and everything else they eat is fine to be unmedicated.
NOTE
General feeding advice: something I cant stress enough, is the value of feeding a good quality layers pellet or mash as their main diet. It is well balanced, containing the right vitamins, minerals, proteins etc. all the extra treats are unnecessary, and could cause problems if overdone. Rather like feeding children on sweets all day and letting them pick at their their proper dinner, leaving it cos they are waiting for something nicer to come along, eg corn, porridge. Mine only get mixed corn at bedtime, and only about eggcupful per bird.
Is it cruel to only rarely feeding a dog doggie choc?