If you are a W-2 employee, you can no longer claim a deduction for unreimbursed employee expenses unless you fall into one of the following categories of employment, or have certain qualified educator expenses.
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Armed Forces reservists.
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Qualified performing artists.
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Fee-basis state or local government officials.
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Employees with impairment-related work expenses.
See IRS Publication 529 - https://www.irs.gov/pub/irs-pdf/p529.pdf
If this is your own business you have more opportunities for deductions. For example, paying for Wi-fi in order to connect with the office or customers. See IRS Publication 334 for small business deductions: https://www.irs.gov/pub/irs-pdf/p334.pdf.
You may deduct meals provided they are with a current or potential business customer, client, consultant, or
similar business contact. https://www.irs.gov/pub/irs-pdf/p463.pdf