Your question about whether all glass is food safe got me to wondering myself. I found this answer regarding fused glass:
The official answer from the glass manufacturers is, All tested compatible glasses have been tested by the FDA for food bearing surfaces and were determined to be suitable.However, if you add other processes or compounds to the items, for example paint, stains, decals, glazes, etc. it is important to check that these items are also approved for food bearing surfaces...Also, at Delphi we take food safety and dinnerware very seriously. We always recommend that certain glasses are capped with clear. These are usually irids, dichro and glass with texture, since these can also trap food particles.
The concerns raised here regarding fused glass would also apply to blown glass, as pretty much the same glass is used for both types of glassworking, only the starting shapes are different (glass stringers vs. glass sheets).
So basically, whichever way you created your final product (slumping/fusing would probably work best here), you would want to encapsulate any colored glass or decorative elements within a coating of clear glass to ensure food safety.
In addition, the article quoted above points out:
it is of the utmost importance that dinnerware items be properly annealed, especially if youre going to place hot food on them - the thermal shock could cause a break in poorly annealed items.
I am sure that you could find someone to make this product for you--however, keep in mind that it is likely to be quite expensive. Most glassware is manufactured in industrial factories, making it fairly cost-effective. But, whether you did it yourself, or found someone to do it for you, hand-making individual glass dishes is going to be quite a bit more expensive.
Just for fun, I did a quick look to try and figure out what your cost might be. Based on the prices (in US dollars) on this website:
- A mold for forming your dish (this one isn't exactly right, but it is as close as I could find on this website-$24.89:
- a 9" circle of clear glass-$15.90
- A kiln-$715.91 (this is my best guess--as a very novice glassworker--about the least expensive kiln that will handle your project)
So, to make one of these containers yourself, it appears that you would have to pay $756.70 for the first container. Additional containers would be a comparative steal at only $15.90 a piece.