Is the packaging compostable or infinately recyclable?

when you are done with the package toss it there is nothing on the package that says to recycle.

How much to use if making ice cream?

A very small amount goes a long way. Usually 0.5-2% is all you need. You may want to look up on Google if there are any specific recipes or guidelines for ice cream.

Can you use this to thicken up home made cream cheese?

I would suggest you go onto Modern Pantry’s website to see if they have suggestions and recipes for making cream cheese with their products. There are many choices to choose from