Good luck Bobby. Why not try grubbing around in the mud by the margins with a fishing net or even a small landing net. all the natural baits the your intended catch will naturally eat will be there.
Where natural baits are concerned the fish not only know what they like to eat but exactly where, in lake or stream, that they can best find it so its not a lot of use taking bait fom the margins and then chucking it into the middle of the lake, unless of course that bait would naturally be found there.
I noted your question in another thread about using slugs for carp and I can not find a definitive answer in all of the reference that I have, albeit many anglers have said that they have taken Carp on slug. I have always sworn by slugs for Chub and Barbel but have no experience using them as bait for Carp as I am not now a Carp fisherman. Carp naturally grub around for their food, mouthing around in the lake bed and up and down the reeds. I have also noticed whilst watching the carp in my son in laws large pond that when surface feeding they can not see the food as they take it in their mouths. They can see it about a foot away but as they reach the food on their final approach they loose sight of it completely and seem to rely on their trajectory through the water to end up in about the right place. I am not sure what value this observation has but the natural sucking and blowing habit of the Carp appears a bit hit and miss, a kind of two stage operation, suck the bait in, decide if you like it, blow it out if you don't sort of thing. Again I don't know what this has to do with slugs but it would appear that, during this sifting process, they will take just about any food that is natural within their environment. There exists a large black water slug that, on maturity, makes its way to the surface in the margins and hatches into a large beetle. I am aware that they will eat this one if found so why not other species of mollusk that may inadvertantly have been washed into the margins.
Roll on the end of the monsoon season. - Clive