Much though I hate to agree with him Carrot has a good point there..... all water soluble incredients = magic disappearing in water boilies !
My basic boilie mix, cribbed from a half dozen sources, you know who you are, is:
6oz Semolina
4oz Soya Flour
2oz Milk Powder
2oz Ground Rice
2oz Maize or Corn Meal
which by no accident at all works out at 16 oz / a pound / 500g = a four to six egg mix (depending on size of egg).
If you can't get the maize / corn meal then up the Soya or ground rice by two ounces to make up for it. Don't increase the amount of milk powder. Don't go over 8 oz on the Semolina.
Then add your flavourings. Nice easy but expensive chemicals in the one corner, cheap but bulkier and not so easy to handle naturals in the other. If using naturals with liquid (eg. a can of tuna or liquidised sweetcorn) then allow for the fact that the overall mix must have sufficient base and egg mix to 'carry' it. So if a can of tuna or two mixed in takes the weight up by 4 oz / 100g then you need another egg or two in the mix. Plus probably at least another half pound of base stuff above. I wasted a few mixes of base before working this one out.... if its too wet and sloppy then don't even start trying to roll it let alone boil it.
New to this myself and still experimenting but they work and they're cheap ! Comparatively speaking....
Oh, and if you're a paste fishing type then remember my secret miracle additive, Co-op pizza base mix !!!! Mix with trout pellet powder and / or ground up Koi feed pellets, whizz in food processor and as doing so add (a little) very hot water and then stand back. Remember to stop the food processor before it burns out the engine.... it's that sticky !
But still soft and manageable.
Oh, and a couple of drops of food colour / food flavouring in the water, makes whatever colour / flavour paste you like. I have a lot of success with red/vanilla, red/almond and yellow/banana. Red sorts out the Tench, Crucians seem to prefer the yellow. Not tried green yet, may give that a go.
PS. the antibiotics / antibacterial preservatives in the Koi pellets, when ground down and used to make paste, seems to make an everlasting paste that never ever goes mouldy ! Though I do still refrigerate it between sessions, lets not be silly about this, leave it in a hot car for a week in the summer and you get what you deserve. But still, kept with moderate care it seems to last forever ! Though three to four months is as long as I've kept one lump on the go so far....