Have a great time!! I am not sure if you want to do an art project with the kids or not...you would need SOME help from parents if the guests are only 1, but can be done!
You will need:
Salt (LOTS)
Sidewalk chalk
paper bowls
Dixie cups
funnels
ribbon-for decoration
stickers-for decoration
extra scraps of fabric-for decoration
Ok....you measure our enough salt that would fill the baby food jar and put it in the dixie cup. Then, you have the children pour as much of the salt into their bowl as they want. Then, they take a piece of chalk and stir it around the salt. The chalk color will make the salt the same color. Then, when they like the color, they take the funnel and pour it into their jar. Continue until all the salt is gone.
Some will use ALL the salt for 1 color, others will get creative and "layer" the colors. All is fine. Just remind them, that if they layer and then shake it wont keep the colors as separated as they expect. It will actually just become a blob of salt.
When the jar is full, put the lid on and tie a ribbon around it and put a sticker on top or you can cut a piece of scrap fabric for the lid and then die the ribbon around that for decoration.
Have fun!! It is a GREAT project...but can get a little messy with the excess salt...but the kids LOVE it!!