I find the Bible says to ' taste ' and see...... at Psalms 34:8-9But unfortunately none of that tells me the objective test that will determine whether any real entity I may find is God or not.
After all, we don't have the personal experience Jesus had.
David had many trials or problems in which he had divine help in his saying at Psalms 34:4,8
Or, in other words, through David's personal experience seeing God's hand in his own life.
If we want God to draw us then God will draw people - John 6:44
Thus, through objective study or Bible research to know God we can discover for oneself that or how God can sustain us.
Through personal knowledge as John 17:3 says.
Peter believed that to be true at 1 Peter 2:3.
Even if we only have bare necessities at this time we will have an abundant of good things coming - Isaiah 35th chapter.
So, by 'testing the waters', so to speak, can give us what can determine whether any real entity is or exists.