MMS1 doses are usually taken with 4 fl oz (120 ml) of water. Twenty seven drops is about 1 ml of DMSO solution when using the old Jim Humble standard of 24 drops = 1 ml. Today's standard is 20 drops per ml. You should start with 1 drop DMSO per 1 drop MMS and work up to 3 drops/drop.
I have ingested 1 teaspoon (5 ml) of DMSO in some water a few times with no problems.
I would trust what Jim says! I can't remember if you have Jim's latest book. If not, you really should read it.
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