In your journal entry, debit the appropriate expense account (office supplies, etc) and credit your equity account. The equity account should be called something like Partner Investments or something like that.
You can choose to enter these all separately, on the specific dates listed, or as one entry. Some people choose to summarize the expenses they've paid personally and only enter one entry per month or so, to minimize data entry time and also because the end effect is the same.
Of course, the above is assuming you are considering these purchases to be investments in the company, and not expecting the company to repay you. If you are expecting repayment, you could enter a bill instead, or credit an account like 'Loan from Shareholder' rather than the equity account.