I have a nice window to get out this week (Mo-We), which means that I do not have time to make a last minute purchase (yes, that I should have done months ago, urgh). Bottom line, I do not have a tarp.

The weather forcast looks, well, pretty freaking SWEET:
Mo, Tue & We = Hi/Lo of 80/50 and a 10% - 20% chance of rain

On second thought, I've got one of those blue sh!tty tarps you can find at Wal Mart.

#1 Can I make the said sh!tty tarp work?
#2 Or should I make some super human effort to burrow a real tarp??
#3 Sleeping bag choice: Cheap and crappy 25 deg down bag or the trusty, big bulky 0 deg synthetic bag (6 miles in, 6 miles out)

I am planning a 3 person trip in June, all beginners hanging in hammocks, where the weather will be mid-90's and probably less than 0% chance to rain.

Final question:

#4 Does the tarp provide additional warmth? I know that wind plays a factor: When it's windy, the tarp adds warmth ... right? Overall, what do I need to purchase for my low-budget beginner hammocking pals?

I just need to get my arse in gear and buy me a tarp (or 3?). Thx for the advice and info.

zul