Showers: Can of Febreze.
Eating: Cheapest stuff you can find in a grocery store, McDonalds if you feel like splurging.
Sleeping: Get a sleeping bag and sleeping pad, put them in one of these, and set up a tarp over your head. Find a spot that's out of the way where people won't bother you.
No, actual genuine military surplus can be really great. I bet you can't find a better bivy or a better price on a similar one: https://www.amazon.com/gp/product/B00AMP71BY/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&psc=1