Based on the invoice, I assumed the exhibitor will just want to display their products without any distribution right?
Process food products are limited to personal consumption quantity when hand-carry into Singapore. Thus, my suggestion to exhibitor is:
1) Since is displaying, please just bring along empty bottles & boxes for the display.
2) If need to, per different bottle, just bring in one or 2 tablet for display. Do not bring more than that. If customs officer were to ask, please explain this as for personal consumption.
3) Remember to bring along an invoice for the hand-carry goods as there may be a need to pay for the VAT at the airport.
More information can be obtain from below website.