Learn English – the difference between ‘the study of’ and ‘a study on’

I have coffee on the outside

This means that you have coffee on the outside of something. This does not mean you will drink coffee outside. For example you might be talking about the colour of paint:

It's painted red on the inside, but I have coffee on the outside.

"It has X on the outside" means that X is on the external surface of something.

If you want to say that you normally drink coffee outside then your second sentence is correct.

If you want to say that this time you will be outside, or that you'd like to be served your coffee outside then say:

I will have my coffee outside.

The "projected" date implies that some level of analysis or study has been performed to identify that date.

The "expected" date does not imply any such analysis; expectations may be set by any means, or none at all.

To understand the difference, consider the following:

Given the amount of work and the number of workers, our projection is to be complete by January of next year. However, the sales manager has already told the customer it will be done by July of this year, so that is their expectation.