Hi Jacqueline,

Education.com offers many ideas for science fair projects, including some that don't involve liquid. Here's the collection for elementary school:
http://www.education.com/science-fair/elementary-school/

Here are a few without the use of liquid in the experiment:

Eye Witness, You Witness
http://www.education.com/science-fair/article/eye-witness-you-witness/

Comparing Light Bulbs
http://www.education.com/science-fair/article/comparing-light-bulbs/

Childproof or Not?
http://www.education.com/science-fair/article/childproof_containers/

To learn more about the scientific method and helping your daughter with science fair projects, visit this section: http://www.education.com/topic/help-child-with-science-fair-projects/

Good luck -- I hope all goes well with this science exploration!

...I think you should get clarification on the 'can't have liquids in it' rule.  We had a similar rule at my daughter's elementary school last year (also 5th grade) but what it really meant was this:

The display of the project cannot have liquids in it.

What it did NOT mean was this:

The experiment cannot use liquids.

This meant that the experiment my daughter did could use liquids but she could not bring liquids to school as part of the display.  In fact, her experiment did require the use of liquids, and she took digital pictures of the process she used and had prints of those pictures - pictures of liquids in some cases - in her display.  No problem.

try droping diffrent foods on the floor for 5seconds and put then on a well slide and look at the germs on a microscope