Can anyone recommend a wormer for ferals?

[Kay]

I feed a couple of cats who live in and around my garden - they are not afraid of me but will not let me touch them. I de-flea them using Capstan and Program which I disguise in their food, and now need a wormer for round worms and tapeworms - a spot-on is no good - administering something via food is the only possible way to treat them, but I can't afford to experiment

So if anyone knows of a product which they are unlikely to detect in their food I would be grateful.

[Sniper1]

We use panacur worming granules have done for years widely available in pet stores put them in fridge for couple hours before use makes even less detectable use when cats are usually most hungry mix in small amount of favourite food if your colony feeding an overdose of several times the recommended dose is still safe when it's difficult to regulate who eats what

[Kay]

thank you - will certainly try the Panacur

can't argue with someone who has 18 cats!!