When it comes to stuff like this, I prefer portable tools. Installed once, you can put them on flash or CD and carry with you. Connecting to DB should be easy as filling out usual fields: server, user, pwd..
Sql Buddy
Decent one, open source, with syntax highlighting & code completition. Not recently updated but it generally works OK.
GiPo@DB Utilities
Very nice one, has all of the above features plus its more feature filled as it was previously commercial.
Mentioned tools are not more then few MBs in size and it takes 1 minute to install them and copy them to your portable location.
