Im needing to attach a few MMF dried decorations to fondant covered cake. Any ideas on what to use. I know you can use royal icing, but just don't need that large of an amount.

You could mix a bit of your fondant with some water to glue consistency and use that maybe?

All you need is water. Use your finger or a paintbrush and rub a little water on the back of your decoration until it gets a little sticky. Then stick it to the fondant cake and hold for a few seconds.

tylose powder and water or some tiny pieces of gumpaste in water - it will dissolve and get syrupy.

I also use Wilton candy melts or melted choc as glue in some cases