I find that nothing can replace the taste of fresh citrus juice in cooking.  I use fresh lemon and orange juice often in the kitchen.  If you are vacationing in warm climes, you may be lucky enough to find a citrus tree in the back yard.

One item I can never seem to find in a rental kitchen is a citrus press.  We don't include a press in the kit, because they tend to be large.  Instead we provide this nice wooden reamer.  It will get the job done just fine.