The Tax and Customs Board does not look too kindly on that, because those would be considered costs not related to your business and you would have to pay all the ordinary employee taxes (fringe benefit taxes) on that. If your company's office is located in the same apartment you live in, then you could argue that at least partially your costs are entrepreneurial costs - it is how sole proprietors (FIE - füüsilisest isikust ettevõtja) operate. Do not know of a way to get around food costs though, it is not as if you could mark down every lunch as marketing/sales/client meeting with the limit to representation expenses - 32 EUR per month + 2% from gross salary per month.
As an example, the latest hooplah around enterprise taxation is related to using company cars during private time. If an employer does not allow to use company cars for private purposes, then they will be marked as such in a public registry. If you have a feeling that your neighbor is using his company car outside of work, you can check it and report it to the TCB: http://www.err.ee/643218/erasoiduks-tooauto-kasutaja-saab-na... But if the company car is not registered as such, then you will have to pay fringe benefits tax 1,96 EUR per engine kW per month for newer cars and 1,47 EUR per engine kW per month for cars older than 5 years.
As an exercise to the reader, think about how flat taxation per kW affects companies with electric cars.