Saving money while traveling

Saving money while traveling

I'm traveling to Mississippi for a research trip next week. Obviously my flight is paid for, and my hotel and car rental for 1 day are pretty non-negotiable expenses, but I was wondering how I can save money on food. I'm a vegetarian, which I know is a bit hard in the south, but I'm thinking that getting subway sandwiches for lunch could be decent. I'll also be bringing Luna breakfast bars, granola bars and homemade trail mix with me, along with a nalgene bottle, so I'll have breakfast, snacks and water. The trip is 6 days long. I'm also going to Germany and the Czech republic this summer. With the US dollar/Euro exchange rate so unfavorable to the US, I know spending money will be a nightmare. Does anyone have suggestions on how to handle that? Should I exchange my money now, in case the exchange rate gets worse? Part of me is nervous about traveling with hundreds of Euros on me, though, but I know if I get cash at ATMs abroad or use my credit card (for purchases or cash advances) I will probably be charged about 3% of the price after its conversion to US dollars. Any suggestions on how to avoid fees and keep my expenses low? (In Europe, again, everything will be paid for in advance except food/drink/souvenirs.)
This is sort of gardening, isn’t it?

This is sort of gardening, isn’t it?

pineapple plant!

pineapple plant!

Productive weekend

Productive weekend

Don’t you love spring?

Don’t you love spring?

It’s cold and rainy but. . .

It’s cold and rainy but. . .

This is my room at the moment

This is my room at the moment