It's very simple.
First you would want to keep your local account which has your local details.
-Setup a new Email account
-Visit the itunes store of the country you want to access.
-Click to download a free app (it will then prompt to ask you login/password)
-Create a new account
- There will be credit card inquiry thing/payment information - choose 'none'.
- Fill in details and be sure to include address which is same as that of the store you're in, including number.
-BAM you're done. You can now access both your local store, AND store-of-choice, albeit switching between 2 accounts.
*If you have a cc valid for the country you're visiting, you wouldn't be restricted to free aps.
Good Luck.